JPH02132425A - camera - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of selectively performing full-size photography and half-size photography, and also automatically changes the amount of film feed according to the change in screen size. Regarding cameras that are being changed, in particular, the screen size can be changed without opening the camera back even after film is loaded, and the film feed amount can be automatically changed in conjunction with the screen size switching operation. The invention relates to a camera configured to

[Conventional technology]

Full size (screen size 24mm x 35mm) photos and half size (screen size 24mm x 17.5mm)
) Cameras with switchable screen dimensions are known that can selectively take pictures of (1) and (2).

Conventionally, the following three types of cameras have been proposed as this type of camera.

In other words, (+) A camera that can freely change the size of the shooting screen according to the photographer's intention even after loading film, and (11) After loading film, the shooting screen can only be changed with the back cover open. A camera configured so that the size can be changed and cannot be changed with the cover closed (iii) After loading film into the camera, the camera is ready to shoot the first frame (i.e., the film counter is Even if the photographer's intention changes and it becomes necessary to change the shooting screen size while the camera is displaying 1°, if the film rewind switch is activated, part of the film leader will remain outside the cartridge. Cameras, etc. in which the camera is rewound in the same state, and then the photographer can switch the shooting screen size by opening the back cover, switching the shooting screen size, and then reloading the film. It has been known.

[Problem to be solved by the invention]

However, each of the above three types of cameras had the following drawbacks.

(a) Disadvantages of the camera described in (l) Since the photographed film contains both full-size and half-size films, it is impossible or extremely difficult to simultaneously print all frames of the film in a mini lab.

(b) Disadvantages of the camera in 61) The GD camera does not mix full size and half size like in (a) above, so it is called a “mini lab”.
It becomes possible to print all frames of film simultaneously. However, when the photographer has loaded a new film and is ready to shoot (i.e. autoloading
If you need to change the shooting screen size (with the film counter displaying ゜゛1゜'),
When the photographer opens the back cover and attempts to change the shooting screen size, the film exposed from the batrone is exposed, causing a problem in that part of the film is wasted.

To avoid this, rewind the film once and then switch the shooting screen size. Modern fully automatic cameras automatically rewind the film leader into the batrone when rewinding the film. At the end of the film rewind operation, the film leader section is fully retracted into the cartridge, and as a result, the film in the cartridge cannot be used unless a tool is used to pull out the leading edge of the film. This will cause problems.

(C) Disadvantages of the above-mentioned Gii) camera Although countermeasures have been taken for the above-mentioned problems (a) and (b) in the above-mentioned GiD camera, in order to switch the shooting screen size after loading the film, it is necessary to rewind once. Because it is necessary to change the shooting screen size and then load the film again, the shooting preparation operation becomes complicated and takes a long time.
There was a risk of giving the impression to camera users that it was easy to miss photo opportunities and that it was difficult to use.

An object of the present invention is to eliminate the drawbacks of the camera described in 011) above, and to eliminate the need for complicated operations to constantly change the screen dimensions not only before the first frame is taken, but also before the second and subsequent frames are taken. The purpose of the present invention is to provide an improved camera that can perform the following tasks.

[Means to solve the problem]

The camera of the present invention includes a screen size change operation member provided on the outer surface of the camera, and a screen size change means that responds to the operation of the screen size change operation member, and the screen size change means includes a film loading device. A first means is provided that allows changing to each screen size before shooting the first frame at the end of the subsequent film feed, and also allows changing from a specific screen size to another before shooting the second frame and thereafter. The present invention is characterized in that a second means is provided for making it possible to change to a specific screen size only once. That is, in the camera of the present invention, the screen size can be changed at any time, but after the second frame, the screen size can only be changed once.

Therefore, it becomes possible to print processed film in a minilab.

[For production]

When the screen size switching operation button 26 on the outside of the camera is operated while the film counter display is "1"', the electromagnet 136, which is the driving means for the screen size changing means, is activated.
is excited, which causes the planetary lever 15 to act as an electromagnet 136.
As a result, the power of the rewind motor 116 can be transmitted to the screen size switching gear 9. When the rewind motor 116 is driven by the control means, the screen size changing means is driven via the gear 9 to change the screen size.

This screen size changing operation is performed with the back cover closed, so there is no fear that the film will be exposed, and there is no need to reload the cartridge. This screen size switching can be done by switching from full size to half size or from half size to full size.If the film counter display is "゜1゛゜, it is possible to switch to either size, and what is more, Changes can be made at any time.

Further, even if the film counter display is 2° or more, the screen size can be changed only once.

〔Example〕

Embodiments of the camera of the present invention will be described below with reference to the drawings.

1 and 2 are diagrams showing the structure and operating state of the mechanical structure related to the screen size changing means in the camera of the first embodiment of the invention, and FIG. FIG. 3 is a front perspective view of the camera.

In FIG. 3, 23 is a camera body, 24 is a photographic lens, 25 is a shirt release button, 26 is a screen size switching operation button 27 is a film counter display section, 2
8 is a strobe light emitting window. 29 is the front window of the finder. 3
0 is the photometric window. 31 is a distance measuring window.

Inside the camera body 23, as shown in FIGS. 1 and 2, there are various link lever mechanisms, which are the mechanical components of the screen size switching means, and a power transmission system, which is the mechanical component of the film feeding means. etc. are arranged.

The following description will first be made with reference to FIGS. 1 and 2.

In Figures 1 and 2, 1 and 2 are screen size switching wings that switch the screen size from full size to half size by shielding a part of the shooting screen of the camera body from light when shooting at half size. . left wing 1
has a protruding pin (not shown) at the bottom that is rotatably supported by the camera body as a rotation axis, and a protruding pin lb which is rotatably supported by the winding base plate (not shown) at the upper part.
It also has a fitting protrusion 1a for fitting the interlocking lever 4 that interlocks with the movement of the wing 1 into the wing 1.

Like the wing 1 described above, the right wing 2 also has projecting pins on the upper and lower sides, and an interlocking lever 5 is provided adjacently so as to interlock with the movement of this wing 2.

6 is a left drive lever for driving wing 1;
The lever 6 is connected to the protruding pin (
(not shown). The protruding pin 4 of the interlocking lever 4 is attached to the left end arm 6b of the lever 6.
A notch 6C is formed for slidably inserting a.

7 is a right drive lever for driving the wing 5;
The lever 7 is connected to a protruding pin (
(not shown) so as to be rotatable about the hole 7a. The interlocking lever 5 is attached to the right end 7b of the lever 7.
A notch 7c is formed into which the protruding bottle 5a is slidably inserted.

8 is a connecting lever that connects the left drive lever 6 and the right drive lever 7. The lever 6 is connected to the lever 6 by a connecting pin (not shown) inserted into a pin hole 8a formed at the left end of the lever 8 and a pin hole 6e formed at the right arm 6d of the left drive lever 6. The lever 8 is pivotally connected to the lever 8 by a connecting bottle (not shown) inserted into a bottle hole 8b formed at the right end of the lever 8 and a bottle hole 7d formed at the left end of the lever 7. The levers 7 are pivotally connected to each other.

Connection lever 8, left drive lever 6, and right drive lever 7
The link mechanism constitutes a so-called bell crank mechanism, in which the left and right drive levers 6 and 7 are interlocked with each other via a connecting lever 8.

Two mutually parallel arm portions 8d and 8e that protrude laterally are formed approximately in the center of the connecting lever 8, and between the arm portions 8d and 8e is a protruding pin of a screen size switching gear 9, which will be described later. 9
A U-shaped groove 8C is formed into which a can fit.

10 to 14 are rewinding gear trains included in the film feeding mechanism. The gear train includes a planetary gear mechanism consisting of a sun gear 11, a planetary gear 12, and a planetary lever 15, and the planetary gear mechanism serves as a power transmission means for the screen size switching means and a power transmission means for the film feeding mechanism. It also serves as

The planetary lever 15 is relatively rotatably supported by the shaft 11a of the sun gear 11, and also supports the shaft of the planetary gear 12 so as to be relatively rotatable, and the lever 15 is in frictional engagement with the sun gear 11 and the planetary gear 12. It matches.

An electromagnet 136 consisting of a yoke 17 and a coil 16 serves as a control means for restraining the planetary lever 15 at a predetermined position.
is provided within the rotation locus of the vertically bent portion 15a of the planetary lever 15.

When the coil 16 is energized and the yoke 17 is excited, the vertical bent portion 15a of the planetary lever 15 is attracted to the distal end surface 17a of the yoke 17, thereby restraining the lever 15 in a predetermined position. ing.

The planetary lever 15 is connected to the tip surface 17a of the yoke 17 of the electromagnet.
A spring 18 is fixed to the tip 15b of the planetary lever 15 to bias the planetary lever 15 away from the planetary lever 1.
5 is not attracted to the yoke 17 of the electromagnet (when the coil 16 is not energized), the tip of the spring 18 comes into contact with an unillustrated part of the camera body, causing the planetary lever 15 to move as shown in solid line in FIG. Hold it in the position shown.

When the coil 16 is not energized (that is, when the planetary lever 15 is in the solid line position in FIG. 1), the planetary gear 12
The planetary gear 12 is meshed with the gear 9 when the coil 16 is energized and the planetary lever 15 is attracted to the end surface of the yoke 17 of the electromagnet. The gear 14 is engaged with a fork gear (not shown), and the gear 10 is a gear driven directly or indirectly from a motor (not shown).

Reference numeral 19 denotes a limit switch having a long contact piece 19a and a short contact piece 19b.The contact piece 19a is arranged on the rotation locus of the pin 5a of the interlocking lever 5, and is engaged with the pin 5a. It is designed to match. limit switch 1
Reference numeral 9 denotes a half-size switching completion detection switch for detecting that the screen size has been switched to half-size by the wings 1 and 2.

20 is a limit switch having a long contact piece 20a and a short contact piece 20b, and the contact piece 20a is arranged on the rotation locus of the pin 5a of the interlocking lever 5. The switch 20 is a full-size switching completion detection switch for detecting that the screen size has been switched to full-size by the wings 1 and 2.

21 and 22 are doggle springs, one arm of which is connected to the protruding pins 4a and 5a of the interlocking levers 4 and 5, respectively.
The other one is engaged with an engaging part provided on the winding base plate. As is well known, the direction of the biasing force of this toggle spring is reversed at approximately the halfway point of its operation, so the left and right wings are biased to their respective positions of full size or half size. , it is possible to prevent the wing from stopping in the middle of operation.

FIG. 4 is a rear view of the camera when the back cover is opened, as seen from the rear of the camera. In FIG. 4, 32 is an eyepiece window of the viewfinder, 33 is a cartridge chamber, 34 is a known fork inserted into the cartridge chamber 33, 35 is a film winding subroutine, and 36 is engaged with the perforation of the film to rotate. Known subrockets, 39 and 4
0 is the guide rail that guides the film, 121 is the gastric roof (
(not shown) is closed, and 122C is a film contactor 14 of a film presence/absence switch 122, which will be described later, and is pushed forward by the film when the photographing surface of the film is present in the aperture of the camera.
0 is a film sensitivity detection switch that engages with a film sensitivity code recorded on the surface of the cartridge to generate an electrical signal representing film sensitivity.

FIG. 5 shows the structure of the film feeding amount detection means, in which 36 is the above-mentioned subrocket, 37 is a known encoder plate attached to the shaft of the subrocket 36, and 38 is a light emitting element and a photoelectric conversion element. This is a known photointerrupter consisting of:

FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 4, and FIG. 6(a) shows a state in which no film is present in the aperture, and FIG. 6(b) shows a state in which a film exists in the aperture. It shows.

In FIG. 6, 41 is a pressure plate fixed to the inner surface of the back cover (not shown), and 122 is a film presence/absence detection switch having switch pieces 122a and 122b and a film contactor 122c. When F exists in the aperture, the film contactor 122C is pushed by the film F and the switch pieces 122a and 122b come into contact with each other, as shown in FIG.
2 is turned ON.

Figure 7 is a rear view of the camera with wings 1 and 2 positioned at half-size positions, Figure 8 (a)
8(b) is a diagram showing a state in which the film presence/absence switch 122 determines that ``film is present'', and FIG. 8(b) shows a state in which the switch 122 determines ``no film''.

Next, the electrical configuration equipped in the camera of this embodiment will be explained with reference to FIG. Note that the screen size changing means described above is constituted by a microcomputer, various detection switches, etc., which will be explained below.

In FIG. 9, 101 is a microcomputer (hereinafter referred to as microcomputer) that controls the operation sequence of each part of the camera.

Reference numeral 102 is an oscillation circuit that generates a clock for determining the period and timing between the microcomputer 101 and peripheral circuits, and its output is connected to the clock input terminal (CLO) of the microcomputer 101.
CK) is man-powered.

RAM 103 is a memory for storing data;
4 is a ROM (Read Only Memory) that stores programs executed by the microcomputer 101;
5 is a reset circuit that detects the voltage of the battery 138 and outputs a reset pulse to the microcomputer 101 when the voltage is below a specified value; 106 and 107 are atres paths connecting the RAM 103 and ROM 104 to the microcomputer 101; and data bus, 108 is RAM 103 and R
A control bus 109 connects the OM 104 to a known distance measuring circuit (connected to the AF port of the microcomputer 101).

Below, the connection ports of the microcomputer 101 are shown in parentheses.

110 is a known photometry circuit (AF boat), and bidirectional communication is performed between the distance measurement circuit 109 and the photometry circuit 110 and the microcomputer 101 as necessary.

111 is a shutter control circuit (SH boat) that opens and closes the shutter according to control signals from the microcomputer 101; 112;
is a decoder and LCD driver circuit (which generates a signal for driving a cD (i-crystalline display) 113 in response to pulses from a film counter in the microcomputer 101).
(hereinafter abbreviated as decoder driver). The decoder driver 112 has a zero suppress function that displays a blank when the 10th digit of the film counter is 0.

Reference numeral 114 (middle row on the left in FIG. 9) is a half-size display LED (HL boat) that lights up when the screen size of the camera is set to half-size when the film is loaded, and 115 drives the film rewind motor 116. Trihar circuit (MOTRW boat), 117 is a driver circuit for driving the film winding motor 118 (
MOTW boat), 119 is shirt tally button 2
5 (Figure 3) is a release switch (RL boat) that is turned on when the film is half-pressed, and 120 is a release switch (RL boat) that is turned on when the film is halfway pressed. Rewind switch (MR
EW boat), 121 (see also Figure 4) is the back panel switch that turns ON when the back panel is closed (BCOV boat)
．． 122 (see also FIGS. 4 and 5) is the already explained film presence/absence switch (FiLD boat); 123
The screen size changeover switch (displayed on the middle right side of Figure 9) is the screen size changeover switch that is turned on when the screen size changeover button 26 (see Figure 3) on the top of the camera is operated (when the switch 123 is open, the screen size is full). 124 (displayed in the left middle row of FIG. 9) are photointerrupter detection circuits (pulse shaping circuits) connected to the output terminal of the photointerrupter 38 shown in FIG.
131 is a pull-up resistor attached to each switch; 13
2, when the screen size changeover switch 123 is turned on, the one-shot display screen is set to 8 PEXG of the microcomputer 101.
One-shot pulse generation circuit powered by boat, 133
(PiPuLO to PiPuL3 ports) are pinary counters that count the output pulses of the circuit 124, and the reset pulse is the PiRE of the microcontroller 1o1.
19 is a film feed amount counter with a reset function configured to be operated manually from an S boat;
A wing half position detection switch that turns ON when wings 1 and 2 shown in the figure stop at the half size position;
20 is a wing full position detection switch that is turned on when the wings 1 and 2 stop at the full size position as shown in FIGS. 135 is the already mentioned electromagnet shown in FIGS. 1 and 2, and 137 turns on or off energization to the coil 16 of the electromagnet 136. transistor for,
Reference numeral 38 denotes the previously described photointerrupter consisting of a light emitting element 38a and a light receiving element 38b.

10 to 14 show flowcharts of programs executed in the microcomputer 101, and Tables 1 and 2 described below are for the microcomputer 10.
1 shows the contents of operations performed in response to commands issued from each boat and human signals input to each boat.

Microcomputer ports and their contents (Table 1) Memory addresses and their contents (Table 2) Next, regarding the general operation of the camera of this embodiment, the flowcharts in Figures 10 to 14 and Figures 9 and 15 are shown. This will be explained with reference to.

When the battery 138 is loaded into the camera, the power is connected to the motor and various electronic circuits in the camera, and first, a reset pulse is output from the reset circuit 105 (power-up clear) and the reset terminal (R
ESET), and the microcomputer 101 starts operating from step #100 in FIG. First @100
Initialize the distance measurement, photometry, and shutter control circuits at step #10l.
In order to set the display of CDll3 to ``'00'', 0 is output to the output ports (FCOO to FCO13). The decoder triper 112 is configured to display a blank (zero subless) when the 10th digit (PCI) of the film counter is 10, so the actual display on the LCD 113 is ``0''.

Next, in #102, the winding and rewinding motors 116
and 118 are in a stopped state, and film feed amount counter 1 counts the pulses of the film interlayer at #103.
After resetting 33, the power to the wing switching electromagnet 136 is turned off in #104, and the power is turned off in #104.
Wing half size position detection switch 19 at 5
is ON (“L゜゛ level)”.
“If the level is #106, half size display LE
After turning on D114, the microcomputer 101 enters a HALT state in which it only holds data but does not operate.

Next, when the camera user opens the back cover of the camera, inserts the film cartridge into the batrone chamber, and closes the back cover, the back cover switch 121 is turned on and the microcomputer 101 is turned on.
A signal is input to port BCOV of , and execution of the autoloading program shown in FIG. 11 is started.

That is, when the back cover is closed, the microcomputer 101 rises from the H8LT state and starts executing the program from #200. First, it is determined in #200 whether the back cover is closed, and if it is closed, it is determined in #201 that the back cover is closed.
Operate one tyre, wait for a predetermined time, and wait for the film to stabilize if there is film in it. Thereafter, in step #202, it is determined whether there is a film or not, and if it is determined that the film is present (if the film presence/absence switch 122 is ON), the process proceeds to $203. Conversely, if no film is loaded, the microcomputer 101 enters the HALT state.

On the other hand, if it is determined in #202 that the film is loaded, the reset of the film feed amount counter 133 is canceled in #203, and the winding motor 118 is driven in #204 to start the blank feed of the film.

Next, in #205, it is determined whether 16 pulses from the photointerrupter 38 have been input to the counter 133, and if the manual power is sufficient for 12 pulses, that is, 3 frames in the full size state, the hoisting motor 118 is activated in #206. By stopping the film, the blank feed is completed and the first part of the film is
Pieces are positioned in the apertures. Finally, in #207, after setting the display on the LCD 113 to "01°",
In #208, the screen switching flag (APEXF) is reset to zero, and the microcomputer 101 enters the }IALT state.

Next, the operation when photographing will be explained with reference to the flowcharts of FIGS. 12 and 13.

When the camera user presses the release button 25 of the camera, the release switch 119 shown in FIG. 9 closes and the microcomputer 1
01 rises from H8LT and starts execution of the program from #301. First, distance measurement control is performed in #301, and photometry control is performed in #302.The microcomputer 101 determines the shutter opening time based on these results and the film sensitivity detection result, and performs shutter control in #303.

When the exposure of the film is completed, the reset of the counter 133 is canceled in #304, and the drive of the winding motor 118 is started in #305 to start winding the film. Next, in #306, the timer t3 starts counting for a predetermined period of time, and in #307, the state of the screen size detection switches 19 and 20 is determined, and if the screen size detection switches 19 and 20 are set to full size (ESH-H), #308
It is determined whether the counter 133 has counted four output pulses from the photointerrupter 38, and if so, the process proceeds to #315, and after stopping the count of the timer t3 for a predetermined time, the process proceeds to #316.
and reset the t3 timer. After that #318~#3
After incrementing the counter at step 20, the microcomputer 101 enters the HALT state.

On the other hand, if the counter 133 does not count four output pulses from the interrupter 38 in #308, it is determined in #309 whether the t3 timer has finished counting the predetermined time. If the counting of the predetermined time t3 has ended, it means that the film has not finished its winding operation within the predetermined time t3. Even if the microcomputer 101 issues a command to drive the film winding motor 11B after the last frame of the film has been photographed, the film is stuck between the cartridge and the film winding spool and does not move, so the photo interrupter 38 outputs This results in a state where no pulse is generated. Therefore, the boat PiPuL(1 ~ PiPu
l. 3 does not have a human signal, so microcontroller 10
1 enters film rewinding operation.

That is, the t3 timer counter is reset in #310, and the rewinding motor 11B is driven in #311 to start rewinding the film.

Regarding the subsequent operations when rewinding the film, see Chapter 13.
Since it is the same as step #410 and subsequent steps of the mid-rewind program shown in the figure, the explanation will be omitted. Note that the sequence after #410 will be described later.

On the other hand, if the film size is determined to be half size in #307, it is determined in #313 and #314 whether two pulses from the photointerrupter are input to the counter 133, and furthermore, the timer t3 counts up for a predetermined period of time. Determine if there are any. Note that the subsequent program is the same as the full-size case, so the explanation will be omitted. It goes without saying that the film feed amount for full size is twice the film feed amount for half size.

In addition, the count time of the t3 timer is set to be sufficiently longer than the time required to wind up one frame at full size, taking into consideration the drop in power supply voltage and temperature fluctuations.

Next, referring to the flowchart in FIG. 13 regarding the case where the mid-rewind switch 120 is pressed when all frames of the film in the cartridge have not been photographed (that is, unexposed frames remain). explain.

When the rewind switch 120 is pressed, the microcomputer 101 wakes up from the HALT state and starts the sequence from #40o. In #400, it is determined whether the film is loaded, and if it is not loaded, HAL
It becomes T state. On the other hand, if film is loaded, #
401, #402, the film counter L
It is determined whether the display on the CD 113 is "oi", that is, the film is loaded but no pictures have been taken.If no pictures have been taken, go to #403. The reset of the film feed amount count 133 is canceled and the drive of the rewind motor 116 is started in #404.

Next, in #405, confirm that the pulse count value has become 4, and after rewinding by one frame, in #406, set the display of lc:D113 of the film counter to "00°." Then, in #407, check to see if there is a film. By determining that the switch 122 is turned off and stopping the rewind monitor at #408 at the moment the switch 122 is turned off, the film is stopped in the state shown in Fig. 8(b), so that the film is not wound into the cartridge. can be prevented.

Finally, in step #409, the film feed amount counter 133 is reset and the microcomputer enters the HALT state. On the other hand, when the halfway rewind switch 120 is pressed and it is determined that the display on the LCD 113 is ``゛゜01''' or more, the rewind motor 116 is driven in #4lO to start rewinding, and in #411 the screen is The size is determined. If it is determined to be full size (FSH-1{), #4
12, counting upward from the LSB of counter 133, 3
bit (PiPuL) 2, or in the case of half size, the second bit (PiPuL) from the LSB in #42o
L) Determine the inversion timing of the 1 bit, and if these are inverted, subtract the display value of the LCD 113 in steps #413 to #417.

Here, in the case of full size, the counter is subtracted every 4 pulses because it is the inversion of (PiPuL)2, and on the other hand, in the case of half size, it is the inversion of (PiPuL)t, so the counter is subtracted every 2 pulses. #413 to #417 are steps for processing the subtraction of this counter. In #413, the first digit (FCO) of the counter is subtracted by 1, and as a result, it is determined in #414 whether a carry is output, and it is output. If so, in #415 it is determined whether the 10th digit of the counter (F C 1 ) is not zero, and if it is not zero, it is determined in #4l6 (F C 1 ).
CI) minus 1.

Next, in #417, the first digit (FCO) of the counter is set to 9, thereby performing subtraction in decimal form. Furthermore, if carry has not occurred in #414, it is determined in #418 whether or not the screen size has been changed during film rewinding, and if the screen size has been changed (APEXF
-1), rewind with #419: ff Ma (FCO, PC
I) is l from the number of switching frames (APEXLAPEX}I)
Determine whether the O digit and the 1 digit are small, and if they are small, select #4.
Proceed to step 20, determine the screen size state when you start rewinding (wing set state at the time of rewinding), and if the screen size at the start is full, the next count will be counted at half size (# 421 and later), and conversely, if it is in a half state, the next count will be counted in full size (#412 and thereafter).

When rewinding the film when the screen size is changed, the system is configured so that the appropriate film count value is always subtracted by determining the screen size at the start of rewinding and the frame at which the screen size was changed. There is.

If the screen size was not changed during the process (@
418), #
The judgments in steps 419 and #420 are not made and subtraction of the next frame is started again.

Also. The film count value is zero in #415 (FCI-
0, FCO-0), the film presence/absence switch 122 is monitored in #422. In this state, when the rewinding progresses and the leading edge of the film reaches the state shown in FIG. 8(b), it is determined in #422 that there is no film.
#4 after the t2 timer setting time has elapsed in #423
At #24, the screen switching flag is reset, and at #408, the rewind motor 116 is stopped. weight timer t2
It goes without saying that the predetermined time period is set to be sufficiently longer than the time required for the film to be wound into the cartridge from the position shown in FIG. 8(b), taking into account power supply voltage and temperature fluctuations.

Next, the operation of the screen size switching means and various means related thereto, which are important parts of the camera of this embodiment, will be explained with reference to FIGS. 1, 2, and 9, as well as FIGS. 14 and 15. This will be explained below.

After the photographer loads the film with the shooting screen set to full size, the camera's screen size switching mechanism switches to the first
The state is shown in the figure. At this time, the LCD 113 (FIG. 9) of the film counter shows ゜゛1'', and therefore the screen size can be changed.As mentioned above, in the camera of the present invention, the display of the film counter is ゜゛. The configuration is such that the screen size can be switched even if the value is 1° or more.

Here, in order for the photographer to switch the shooting screen size, there is a screen size switching button 26 (
When the screen size changeover switch 123 shown in FIG. 9 is operated, the falling pulse causes the one-shot pulse generation circuit 132 (see FIG. figure). The microcomputer 101 is configured to generate a screen size switching interrupt when a rising pulse is manually input to the input port APEXC, so when a one-shot pulse is input, the screen size switching program shown in FIG. 14 is executed as shown below. Start like this.

In steps #500 and #501, the microcomputer 101 determines whether or not the display on the LCD 113 of the film counter is ``1°'' or less.
6 is energized to excite the electromagnet 136 as shown in FIG.

Further, even if the display on the LCD 113 is ゛゜2゜ or more, if it is determined that the screen size has not been changed even once (APEXF-0), the coil 16 of the electromagnet 136 is energized.

When the electromagnet 136 is excited, the leading end 15a of the planetary lever 15 is attracted to the leading end surface 17a of the yoke 17 in FIG. It is rotated counterclockwise in FIG. 1 as shown in FIG. As a result, the planetary gear 12 becomes the gear 1
3 and meshes with gear 9.

On the other hand, after energizing the electromagnet 136, the microcomputer 101
In step 3, determine which state the screen size is currently set to (before switching), and set the FSF boat to "L".
If the level is determined that the screen size is full size,
At #504, driving of the rewind motor 116 is started.

When the motor 116 starts rotating in the rewinding direction, the screen size switching gear 9 starts rotating clockwise in FIG. d and 8e, and the connecting lever 8 starts to move in the direction A in FIG. 1. At this time, the left drive lever 6 rotates counterclockwise around 6a, and as a result, the left wing 1 moves the interlocking lever 4.
Since the protruding pin 4a is driven by the left drive lever 6, it begins to rotate clockwise, that is, in the half-size direction, about the protruding pin 1b.

Similarly to the left wing, the right wing 2 also starts rotating in the half-size direction via the right drive lever 7. As the screen size switching gear 9 continues to rotate, the left and right wings gradually continue to rotate to the half-size position. When both blinkers reach the half-size position, the protruding pin 5a of the interlocking lever 5 pushes one contact piece 19a of the switch 19 (see FIG. 9) downward in FIG. 19a and contact piece 19b come into contact and the switch 19 is turned on.

In this embodiment, there is a play between the diameter D of the protruding pin 9a of the screen size switching gear 9 and the width W of the groove 8C of the connecting lever 8 such that W=D+t, that is, play t (
For example, even if the stop position of the protruding pin 9a varies slightly due to inertia force after the motor 116 is energized, the left and right toggle springs 21 and 22 can adjust the position. The wing can be securely locked in the half position.

The microcomputer 101 turns the switch 19 on in #505.
When it is detected that the screen size is N, it is determined that the screen size has been switched to half size, and the drive of the film winding motor 116 is stopped in #506. Next, $507
energization to the coil 16 of the electromagnet 136 is stopped,
As a result, the planetary lever 15, which had been attracted to the tip surface of the yoke 17, is moved away from the tip surface of the yoke 17 by the force of the spring 18, and the lever 15 is moved clockwise around the shaft 11a of the sun gear 11. rotated in the direction. Therefore,
The planetary gear 12 meshes with the gear 13 again, and the gear 9 is separated from the power transmission system.

On the other hand, the microcomputer 101 resets the photointerrupter counter once in #508, energizes the rewind motor in #5o9, and further determines whether the interrupter pulse count value has reached 1 in #51o, and if it becomes 1, #51l By stopping the rewind motor at , it is possible to correct overfeeding of the film by the number of frames that occurs when switching the aperture from full size to half size. Note that when switching from half to full size, the aperture for the genus frame is duplicated on the previous frame, so the winding for the genus frame is performed in reverse. (
#519~@522) Next, store the number of frames for which the screen size was changed in #512 in the memory, and #5
In l3, by storing the fact that the screen size has been changed as a flag, screen changing from the second time onward is prohibited, and after that, the microcontroller 101 uses the IIA
It becomes LT state.

Contrary to the above, when switching from half size to full size, the microcomputer 101 executes programs #515 to #518, detects the full size position of the wing, and
Performs screen correction by advancing frames.

Note that the above step #500. If the film count value is 2.degree. or more in step #501, screen switching is prohibited and the microcomputer enters the HALT state.

The operating order of the screen size switching means when the photographic screen is switched from half size to full size is also the same as when switching from full size to half size. That is, the sequence is as follows: energizing the electromagnet 136 → meshing the planetary gear 12 with the screen size switching gear 9 → transmitting power to the gear 9 → driving the connecting lever 8. However, in the case of half size to full size, the rotation direction of the screen size switching gear 9 is counterclockwise in FIG. 2
The wings 1 and 2 are moved in the direction of arrow B in the figure, with the result that the wings 1 and 2 are pivoted from the half-size position shown in FIG. 2 to the full-size position shown in FIG.

16 to 19 are plan views showing the mechanical structure of other embodiments of the camera of the present invention, FIG. 16 shows the camera with the back cover open, and FIG. 17 shows the back cover of the camera in an open state. The lid is closed, and Figure 18 shows the state in which preparations for shooting the second frame have been completed.
FIG. 19 shows a state in which a screen size switching operation is performed before photographing the second and subsequent frames.

In FIG. 16, when the photographer attempts to switch the screen size (switching from a full-size screen to a half-size screen in FIG. 16), move the operating section 801a of the full/half switch knob 801 to the right in the figure. By moving the gear 80 of the full-half switching knob 801,
lb drives the gear 802a of the interlocking lever 802 clockwise, thereby switching from full size to half size. Further, switching from half size to full size is similarly performed by the reverse movement to that described above. During this operation, the protrusion 803b of the second tension member 803
is engaged with the protruding portion 801c of the full-half switching knob 801, and the second tension is engaged with the spring 80 centered around the bottle 803a.
4 and 805. However, before the aforementioned switching operation is completed, the protrusions 801C and 801C
03b is released, and the state shown in FIG. 16 is restored by the restoring force of springs 804 and 805.

Next, when the photographer loads film and closes the back cover, a projection 806 (FIG. 17) provided on the back cover pushes in a slide plate 807, as shown in the figure. This slide plate 807
is urged downward in FIG. 17 with respect to the camera body by a spring 808, and the first tension 8
10 is urged upward in FIG. Furthermore, when the back cover is opened, the spring 808 pushes the slide plate 807 downward in the figure, causing the protrusion 80 of the slide plate 807 to
7a moves the protrusion 810a of the first tensioner 810 downward,
As a result, the state shown in FIG. 16 is obtained. When autoloading is started in conjunction with the closing of the back cover, the teeth 811a of the sprocket 811 engage with the perforations of the film, so the sprocket rotates counterclockwise in conjunction with the movement of the film. start. At this time, the pinion 812 that decelerated the rotation of the subrocket 811 similarly begins to rotate counterclockwise, and in conjunction with the movement of the pinion 812, the sun gear 813 rotates clockwise. Therefore,
The planetary gear 814 begins to revolve around the sun gear 813 in the clockwise direction in the figure, and the rack portion 81 of the unlocking lever 815
5a, and moves the lock release lever 815 to the right in the figure against the force of the spring 816.

Thereafter, the release part 815b of the lock release lever 815 pushes the abutted part 816b of the lock lever 816, so that the lock lever 816 rotates counterclockwise about its support shaft 816b against the force of the spring 817. As the locking portion 810b of the first tension member 810 and the locking claw 816b of the locking lever 816 are rotated in do.

In this embodiment, the reduction ratio from the sprocket to the pinion 812 and the sun gear are adjusted such that the series of operations described above is performed when the first frame has been photographed and the second frame has been hoisted. The number of teeth of the planetary gear is also determined. Furthermore, during the winding operation from the second frame onwards, even if the planetary gear 814 rotates, there are no teeth of the rack 815a that engage with the planetary gear 814, so the lock release lever 815 cannot move any further to the right. Therefore, the planet gear 814 idles and remains at the position shown in FIG. 17.

Now, when the first tensioner 810 slides upward in the figure,
The upper end 810c is the contact portion 818 of the swing lever 818.
The swing lever 818 rotates counterclockwise about its support shaft 818b against the force of the spring 819 in order to push the lever 818 upward in the figure. 820 is a lock lever,
The engagement protrusion 818c of the swing lever 8l8 is biased counterclockwise by the spring 821 around its support shaft 820a.
The engaging portion 820b comes into contact with and regulates the position. When the swing gear 818 rotates counterclockwise as described above,
The lock lever 820 is also integrated with the swing lever 8.
The lock lever 820 begins to rotate counterclockwise around the 18 support shaft 818b, but during this operation, the second lock lever 820
The tension engagement portion 820c is the second tension engagement portion 803b.
When the lock lever 820 comes into contact with the swing lever 818, the lock lever 820 rotates clockwise about the support shaft 820a against the spring 821 in response to the rotation of the swing lever 818.

FIG. 18 shows a state in which the above operations have been completed, and FIG. 18 shows a state in which preparations for photographing the second frame have been completed.

Next, an explanation will be given of the operation when the photographer switches the shooting screen size (in this embodiment, from full-size shooting to half-size shooting) from the second frame onward.

When the photographer operates the operation part 801a of the full-half switching knob 801 that protrudes outside the camera in the right direction in FIG. 18, the protruding part 801c of the full-half switching knob 801
engages with the protrusion 803a of the second tension member 803, causing the second tension member 803 to operate clockwise in the figure against the forces of the springs 804 and 805. With this at, the lock lever engaging portion 803b of the second tension 803 and the lock lever engaging portion 8
20c, the lock pawl 820d of the lock lever 820 jumps into a position where it engages with the lock portion 801d of the full-half switching knob 801 at the end of the switching operation. FIG. 18 shows the state at this time.

As explained above, the camera of this embodiment is equipped with a mechanism that allows switching of the shooting screen size for the second and subsequent frames only once, and does not accept it thereafter. It has the same functions as the camera of the embodiment.

In this embodiment, switching from full size to half size has been described, but when switching from half size to full size, the movements of the full/half switching knob and the second tightening are simply reversed.

When the photographing is finished and the film begins to be rewound by known means, the sprocket 811 begins to rotate clockwise, the sun gear 813 rotates counterclockwise, and the planetary gear 814 rotates counterclockwise. Start rotating clockwise. However, once the planetary lever 821 comes into contact with its revolution regulating pin 822, the planetary gear 814 continues to idle after that.

At this time, the lock release lever 815 is released from the engagement between the planetary gear 814 and the rack 815a, so the spring 816
The force causes it to slide to the left to the position shown in Figure 17. Due to this movement, the locking lever 816 also rotates clockwise by the force of the spring 817, and its engaging claw 816b comes into the movement locus of the engaging claw 810b of the first clamp 810.

When rewinding is finished in this state and the photographer opens the back cover,
The slide plate 807 is moved downward in the figure by the force of the spring 808. Therefore, the protrusion 807a of the slide plate 807
urges the protrusion 810a of the first tensioner downward, so that the first tensioner 810 also moves downward, and as a result, the locking portion 810b is locked by the locking lever.

Furthermore, due to the downward movement of the first tension member 810, the swing lever 8
Since the position restriction of 18 is released, it is rotated clockwise by the force of spring 819 with 818b as the rotation center.
The contact portion 818a rotates until it contacts the upper end portion 810C of the first tension member 810. Accordingly, the lock lever also rotates together with the swing lever 818, and finally returns to the initial position shown in FIG. 17.

[Effects of the Invention] As explained above, the camera of the present invention is capable of selecting either full-size or half-size screen size before shooting the first frame, and it is possible to select either full-size or half-size screen size before shooting the first frame. Since the screen size can be changed only once before shooting, it is possible to change the screen size after starting to use the film, and it is also possible to print with "mini-lappo". have. Therefore, according to the camera of the present invention, camera users can be provided with a camera that is easy to use, and film processing businesses can be provided with the effect of not making film processing difficult.

[Brief explanation of drawings]

1 and 2 are plan views showing screen size switching means and related parts in a camera according to an embodiment of the present invention, FIG. 3 is a perspective view showing the external appearance of the camera according to the embodiment, and FIG. The figure is a rear view of the camera seen from the rear with the back cover open, Figure 5 is a diagram showing the film feed amount detection means and its related mechanical structure, and Figure 6 (a) is the same as Figure 4. Vl −
FIG. 6(b) is a cross-sectional view taken along the Vl arrow, and FIG. 6(b) is a diagram showing the structure shown in FIG. 6(a) with the film positioned at the aperture. FIG. 7 is a diagram showing the camera screen in half size. FIG. 8(a), which is a rear view seen from behind with the back cover open in the set state, shows a state in which it is determined that ``film is present'' by the film presence/absence detecting means installed in the camera. FIG. 8(b) is a diagram showing a state in which the film presence/absence detecting means determines that there is no film, and FIG. 10 to 14 are flowcharts of the program executed by the microcomputer shown in FIG. 9, and FIG.
The figure is a time chart of control operations performed in connection with the flowchart shown in FIG. 14, and FIGS. 16 to 19 are plan views showing the operating states of the screen size changing means of the camera according to the second embodiment of the present invention. Figure. 1.2... Wing 8 (for changing screen size)
...Connection lever 9...Switching gear 9a (for switching screen dimensions)
... Bin 11 ... Sun gear 12 ... Planet gear 15 ... Planet lever 16 ... Coil 17 (of electromagnet 136) ... Yoke 18 (of electromagnet 136) ... Spring 19 ... Wing half size position detection switch 20
...Wing full size position detection switch 23...
Camera body 24...Photographing lens 25...Shirt release button 26...Screen size switching operation button 33...Patrone chamber 34...Fork 35...Wind-up subroutine 3
6... Subrocket 37... Encoder plate 38.
...Photointerrupter 39.40...Guide rail and 4 others Figure 5 Figure 6 (a) Figure 8 (α) (b)

Claims (1)

[Claims] 1. A screen size changing means, and a screen size changing operation member capable of operating the screen size changing means when the back cover is closed; The first function allows you to change the screen size to various types before shooting the first frame at the end of the film feed, and the screen size can only be changed once before shooting the second frame onward. A camera characterized in that it is equipped with a second function that allows.