JPH0720552A - camera - Google Patents

Abstract

(57) [Abstract] [Purpose] At least the main part of the electronic circuit of the camera is mounted on one board, which enables the wiring efficiency and cost reduction. In a camera in which a subject image is exposed on a film surface pulled out from a film cartridge 23 via an optical system, at least a main IC 2 and a distance measuring sensor 6 of a printed circuit board 1 are included in an electronic circuit for controlling the camera. An LCD 17 is mounted on the film surface side and on the back surface for displaying the operating state of the camera. And
The printed circuit board 1 is arranged at the rear of the film pressure plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of improving the connectivity and reducing the cost of a substrate on which a circuit for electronically controlling exposure, focusing and the like is mounted.

[0002]

2. Description of the Related Art In recent years, still cameras have been used for shutter control,
Electronic technology is involved in all of the exposure calculation, etc., and the electronic circuits for this occupy a considerable portion of the camera space. The electronic circuit is usually mounted on a flexible substrate and distributed in the camera. A technique relating to a mounting board for a camera is disclosed in, for example, Japanese Utility Model Laid-Open No. 63-187130, and a flexible board is arranged behind a film pressure plate to mount the camera so as to surround the entire camera. Alternatively,
As described in JP-A-4-285946, it has been proposed to provide a printed board (hard board) on the rear surface of the pressure plate.

[0003]

However, the conventional technique for disposing the flexible substrate between the film pressure plate and the cover as described above is not reproducible with respect to the mounting position because the substrate is flexible, and the cost is low. There is a problem that up is inevitable. Further, in the conventional technique of mounting the hard substrate on the pressure plate portion, it is difficult to completely eliminate the occurrence of short circuit due to erroneous wiring or defective solder when connecting the substrate and the main substrate with a lead wire or the like. . It is also difficult to save space.

Therefore, an object of the present invention is to provide a camera in which at least a main part of the electronic circuit of the camera, or all the electronic circuits and parts are mounted on a single substrate, and wiring efficiency and cost can be reduced. To provide.

[0005]

In order to achieve the above object, the present invention provides an electronic control for a camera in which a subject image is exposed on a film surface pulled out from a film cartridge through an optical system. At least the main IC of the circuit and the distance measuring sensor are mounted on the film surface side, and a printed circuit board on the back surface of which a display for displaying the operating state of the camera is mounted is arranged at the rear of the film pressure plate. ing.

On the substrate, a strobe oscillation circuit can be provided in which a large current easily flows to cause a voltage drop.

In order to facilitate the attachment of the board, a fitting portion or a pin member that can be connected to a pin member or a fitting portion provided on the main body main board side is provided, and the board is provided on the printed circuit board side. The pin member is fixed to the solder land on the printed board by soldering.

The film cartridge can be loaded in the axial direction so that the substrate can be arranged without any trouble.

For easy wiring, the indicator is provided at the rear of the film cartridge.

[0010]

According to the above-mentioned means, not only the main circuits and parts but also the display section are mounted on one printed board, and
This printed circuit board is arranged on the back surface of the film pressure plate, and the respective parts are carefully arranged so as not to interfere with the film transportation and to perform the wiring optimally. Therefore, the electronic circuit can be mounted without using an expensive flexible substrate and without complicating the wiring, and the cost can be reduced.

By mounting the strobe oscillation circuit on the printed circuit board, the wiring between the power supply and the strobe oscillation circuit can be minimized, the operation of the strobe oscillation circuit is not destabilized, and the wiring resistance is reduced. Since it can be made as small as possible, energy efficiency can also be improved.

The printed circuit board and the main body are connected to each other by using a pin member and a fitting member such as a hole and a washer that fit into the pin member, so that it can be easily fixed without using a tool. .

Since the printed circuit board is provided at the rear of the pressure plate, it becomes difficult to replace the film cartridge. Therefore, instead of opening and closing the entire back cover as in the conventional case, the film cartridge is attached and detached in the axial direction, so that there is no restriction on the arrangement position and size of the printed circuit board.

The display mounted on the printed circuit board so as to be located at the rear of the film cartridge is a main I
Wiring between C and other ICs is not restricted, wiring on the substrate is facilitated, and optimal wiring can be performed.

[0015]

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

FIG. 1 is a perspective view showing a substrate portion in an embodiment of a camera according to the present invention, and FIG. 2 is a rear perspective view of a main body portion. 3 is a plan view showing the inside of the camera (finder section), FIG. 4 is a plan view of the central portion, FIG. 5 is a front view of the inside of the camera, and FIG. 6 is a side view of the inside of the camera.

The printed circuit board 1 is a hard type, and the main IC 2 and the photo interrupter 3 are provided on one side thereof.
a, 3b, motor 4 having terminals 4a and 4b, AE (automatic exposure) sensor 5, distance measuring sensor 6, pins 7, 8, distance measuring sensor 9, driver IC 10, oscillation transformer 11 of strobe oscillation circuit, strobe oscillation Circuit transistor 12, strobe oscillation circuit charging capacitor 13, battery 14, contact pieces 15, 16, LCD (liquid crystal display) 17, operation button 18, main body base plate 19 (positioning holes 19a, 19d, distance measuring sensor 6) Each of the shielding hole 19b and the pins 19e and 19f is provided to form the core of the camera housing, and a front cover and a rear cover (not shown) are attached so as to be incorporated therein), and infrared light is used as an object. A lens 20 for projecting light to the main body 19
1. A magnetic head MH and the like are mounted.

The photo interrupters 3a and 3b are for detecting the perforation of the film.
The motor 4 is a drive source for moving the optical system (lens barrel) back and forth (further, it may be used for film winding, shutter charging, etc.) and is directly soldered to the printed circuit board 1 using the terminals 4a and 4b. To be done. The distance measuring sensor 9 is an infrared light emitting element (IRED) that projects infrared light toward the subject, and the distance measuring sensor 6 receives reflected infrared light from the subject. The AE sensor 5 is a sensor that measures the brightness of the subject.

The pins 7 and 8 have flanges and are soldered to the printed circuit board 1 in the vicinity of the distance measuring sensors 6 and 9, and the tips thereof are fitted into the positioning holes 19a and 19d. The pins 7 and 8 are important parts for ensuring the mounting reproducibility, and require high precision. Further, the positioning hole 19d is an elongated hole in order to absorb an error in soldering the pins 7 and 8.

The driver IC 10 is a circuit for supplying electric power to a large current consuming element such as the motor 4 and the distance measuring sensor 9. The battery 14 is used as a power source for a strobe or a circuit on the printed circuit board 1, and is pressed and held by being clipped onto the contact pieces 15 and 16 fixed to the printed circuit board 1 by soldering. The wiring between the contact pieces 15 and 16 and the strobe oscillation circuit is designed to be the shortest. L
The CD 17 is a display device for displaying the operating state of the camera, and the printed circuit board 1 is exposed on the back surface of the camera.
It is attached to the back of.

As shown in FIGS. 3 and 4, a stroboscopic light emitting section 22 is provided beside the finder section, and a film cartridge 23 is loaded at the end of the main body section. Reference numeral 24 is a viewfinder eyepiece lens, and 25 is a taking lens. Further, reference numeral 26 is a pressure plate for holding the film, which has a hole 2
6a is provided.

Further, in FIGS. 5 and 6, 27 is a lens for condensing the light incident on the distance measuring sensor 6, and 28 is a screw for fixing the lens 27. Reference numeral 29 is a window 29 of a transparent portion which is provided on the back surface of the main body and allows the LCD 17 to be seen through. Further, in FIG. 5, reference numeral 30 denotes a cartridge lid, which corresponds to a conventional back lid, and is adapted to open and close only a portion facing the upper portion of the film cartridge 23. That is, the film cartridge 23 can be pulled out upward by opening only the cartridge lid 30 upward instead of opening and closing the entire back surface as in the conventional case. Before the replacement, the used film cartridge 23 has been wound up.

FIG. 7 is an explanatory view showing a method of fixing the printed circuit board. When the printed circuit board 1 is attached to the main body base plate 19, the pins 7 and 8 are soldered to the solder lands 1 a, 1 b, 1 c and 1 d formed on the printed circuit board 1. The solder lands 1a, 1b and 1c, 1d are
It is in a position facing each pin 7 and 8,
The position does not shift when soldering. The tips of the pins 7 and 8 are elongated holes 19 provided on the main plate 19 side.
d (length in the width direction is set to be slightly smaller than the diameter of the pin 8)
And the hole 19a, and the friction force of the main body main plate 1
9 and the pins 7 and 8 are connected to each other and never come off in a normal use condition.

FIG. 8 is an explanatory view showing another fixing method of the printed circuit board. In FIG. 7, the pins 7 and 8 are provided on the main body bottom plate 19 side, but conversely, they may be provided on the main body bottom plate 19 side as shown in FIG. In this case, washers 31, 32 are arranged on the printed circuit board 1 side, and the holes provided at the centers thereof are positioned so as to fit into the pins 19e, 19f on the main body bottom plate 19 side. The washers 31, 32 are soldered to the solder lands facing the solder lands 1f, 1e and 1g, 1h, respectively. Also in this case, FIG.
Similar to the configuration described above, the pins 19e and 19f and the receiving side thereof are held in pressure contact with each other.

FIG. 9 is a rear perspective view showing a second embodiment of the present invention. In this embodiment, the LCD 33 is arranged so as to be located at the rear portion of the film cartridge 23. In most cases, the main IC2 is a QFP (quad flat package) in which lead pins project in four directions. Therefore, by arranging the layout as shown in FIG. 9, the wiring from the main IC2 is a wiring pattern of another IC. On the other hand, it can be prevented from intersecting (although almost no parts can be mounted in a space facing the film cartridge 23 of the printed circuit board 1, a wiring pattern can be formed, and a wiring pattern to the LCD 17 can be formed. 34 can be provided without any restrictions).

Incidentally, in the configuration of FIG. 6, since the LCD 17 is provided on the surface opposite to the main IC 2, most of the wiring by the through hole is directly connected to the LCD 17, and in order to avoid crossing with other wiring, 3 There was no choice but to use a multilayer substrate having more layers.

The LCD 33 is fixed to the printed circuit board 1 via connectors 35 and 36. In this case, the LCD 3 is inserted through the through holes at the connectors 35 and 36.
If wiring is done on the 3rd side, other switches and ICs (main I
Wiring can be done without affecting (other than C2).

Although the magnetic head MH corresponds to a film provided with a magnetic recording portion, it needs to be accurately positioned with respect to the film. Therefore,
Similar to the photo interrupters 3a and 3b, the direction is such that the printed circuit board 1 is directly soldered. In the case of the recording / reproducing head, since the read signal is weak, the magnetic head MH
The path from the main IC2 to the main IC2 has a high impedance and is susceptible to noise. However, by mounting the main IC2 on the printed circuit board 1, the wiring length can be minimized and the influence of noise can be reduced. .

In the above description, the film cartridge 23 is loaded from the upper side of the main body, but it may be loaded from the lower side (bottom side). Similarly, the battery 14 is mounted in the direction orthogonal to the printed circuit board 1, but may be mounted in the vertical direction with respect to the normal position of the camera.

[0030]

Since the present invention is configured as described above, it has the following effects.

According to a first aspect of the present invention, in a camera in which a subject image is exposed on a film surface pulled out from a film cartridge through an optical system, at least a main IC of an electronic circuit for controlling the camera and a distance measuring sensor. Is mounted on the film surface side, and a printed circuit board on the back surface of which a display for displaying the operation status of the camera is mounted is arranged at the rear part of the film pressure plate, so that it is possible to reduce the size and cost. It is possible to improve the accuracy of the component mounting position and simplify the wiring.

In the camera according to the second aspect, since the strobe oscillation circuit is provided on the printed circuit board, the wiring between the power source and the strobe oscillation circuit can be made the shortest, and the operation of the strobe oscillation circuit can be prevented. Since the wiring resistance can be made as small as possible without making it stable, the energy efficiency can be remarkably improved.

According to a third aspect of the present invention, the printed circuit board includes a fitting portion or a pin member that can be coupled to a pin member or a fitting portion provided on the main body bottom plate side.
Moreover, since the pin member provided on the printed circuit board side is fixed to the solder land on the printed circuit board by soldering, the pin member can be easily fixed without using a tool.

In the camera of the fourth aspect, the film cartridge can be loaded in the axial direction thereof, so that there is no restriction on the arrangement position or size of the printed circuit board.

In the camera of the fifth aspect, since the display is provided so as to be located at the rear of the film cartridge, there is no restriction on the wiring between the main IC and other ICs. Wiring on the substrate can be facilitated and optimum wiring can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a substrate portion in an embodiment of a camera according to the present invention.

FIG. 2 is a rear perspective view showing a main body portion of a camera according to the present invention.

FIG. 3 is a plan view showing a viewfinder portion of a camera according to the present invention.

FIG. 4 is a plan view of a central portion of a camera according to the present invention.

FIG. 5 is a front view showing the inside of the camera according to the present invention.

FIG. 6 is a side view showing the inside of the camera according to the present invention.

FIG. 7 is an explanatory diagram showing a method of fixing a printed circuit board according to the present invention.

FIG. 8 is an explanatory diagram showing another method of fixing the printed circuit board.

FIG. 9 is a rear perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Printed Circuit Board 2 Main IC 3a, 3b Photointerrupter 4 Motor 5 AE Sensor 6 Distance Measuring Sensor 7, 8 Pins 9 Distance Measuring Sensor 10 Driver IC 11 Oscillation Transformer 12 Transistor 13 Strobe Main Capacitor 14 Battery 15, 16 Contact Piece 17 LCD 18 Operation buttons 19 Main body ground plate 19a, 19d Positioning hole 19b Shielding hole 19e, 19f Pin 20 Distance measuring lens 21, 28 Screw 22 Strobe light emitting part 23 Film cartridge 24 Eyepiece lens 25 Shooting lens 26 Pressure plate 27 Distance measuring lens 29 Transparent Part window 30 Cartridge lid 31, 32 Washer part 33 LCD 34 Wiring pattern 35, 36 Connector MH Magnetic head

Claims (5)

[Claims] 1. A camera in which a subject image is exposed on a film surface drawn out from a film cartridge through an optical system, at least a main IC of an electronic circuit for controlling the camera and a distance measuring sensor are mounted on the film surface side. A camera characterized in that a printed circuit board on which a display for displaying the operating state of the camera is mounted is provided on the back side of the printed circuit board at the rear of the film pressure plate. 2. The camera according to claim 1, wherein a strobe oscillation circuit is provided on the printed circuit board. 3. The printed circuit board includes a fitting portion or a pin member that can be coupled to a pin member or a fitting portion provided on the main body bottom plate side, and the pin member provided on the printed circuit board side is The solder land is fixed on the printed circuit board by soldering.
The listed camera. 4. The camera according to claim 1, wherein the film cartridge can be loaded in the axial direction thereof. 5. The camera according to claim 1, wherein the display is provided at a rear portion of the film cartridge.