JPH0449932B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bifocal switching type camera,
In particular, the present invention relates to a lens barrier and a barrier moving member that operate in conjunction with each other when the lens is at a wide-angle position to open and close the lens barrier, and disengage when the lens is at a telephoto position.

Conventionally, rear converter type bifocal switching cameras in lens shutter cameras have had a manual switching mechanism or a near-manual switching mechanism, but there are few that switch automatically using a motor, especially when it comes to camera sequences. I can't find anything that uses a motor.

The present invention relates to a focal length switching type camera, and in particular, a lens barrier supported by a movable lens barrel and a barrier moving member provided on a camera body are interlocked when the lens is in a wide-angle position, and in a telephoto position. To provide a focal length switching type camera in which interlocking is interrupted when the lens is in the wide-angle position, and furthermore, the lens barrier can be opened and closed by operating a barrier moving member when the lens is in the wide-angle position.

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

FIG. 1 is an external view of the camera according to the present invention, and FIG.
The figure is an explanatory diagram of the camera in a locked state in which photography is not possible, and FIG. 3 is an explanatory diagram of the camera when the photographing lens is extended to a telephoto photography state. In the figure, 1 is a camera body, 2 is a lens barrel provided on the front side of the camera body, and 14 is a movable lens barrel that holds a photographing lens 3 inside and is slidable inside the lens barrel 2 in the optical axis direction. be. When this photographic lens 3 is viewed from the front side of the camera,
The main lens in front is visible in both the standard shooting mode and the telephoto shooting mode, but in the case of Figure 2,
Since the camera is in a locked state, the photographic lens 3 is protected by being covered in front by the lens barrier 23. 4 is finder,
Whether the camera mode is lock mode, standard shooting mode, or telephoto shooting mode is displayed as described below. Reference numeral 5 denotes a mode selection switching operation member that can be moved left and right by an annual operation, and includes a lock mode L that prohibits the camera's shooting operation, a standard shooting mode W that uses the main lens only as the shooting lens 3, and a standard shooting mode W that uses only the main lens. Three modes can be selected: telephoto shooting mode T, which extends the front of the camera and adds a rear converter lens to the rear and uses it as the shooting lens 3 for telephoto shooting.As shown in the figure, the camera body 1 One of the three modes mentioned above can be selected by lightly operating the left hand while holding the button.
However, this does not apply when switching from another mode to lock mode.

This mode switching mechanism will be explained in detail with reference to FIGS. 2 and 3. Reference numeral 7 denotes a mode selection lever that can be slid in the left and right directions (hereinafter, when referring to directions, the direction is shown when viewed from the front of the camera), and is moved to the left by a mode selection lever spring 6 whose one end is fixed to the camera body 1 side. The elongated hole 7g loosely fits into the pin 7f, which is biased in the direction of the camera body 1, and allows horizontal movement from side to side. Further, projections 7n and 7i of the mode selection lever 7 are provided, and these projections 7h and 7i are provided.
7i includes sections for sliding the first switch 20 and switch 22 (for example, in the case of the first switch 20, first and second sections 201, 2
02) are provided, respectively, and these pieces slide over a group of switch patterns, which will be described later, made of copper foil or the like provided on the printed circuit board on the side of the camera body 1, thereby switching the first switch 20, Switch 22 is opened and closed. The aforementioned operating member 5 is provided on the mode selection lever 7, and is held on the left side by the force of a spring 6 in the lock mode shown in FIG.

Reference numeral 8 designates a strobe locking lever, which is biased clockwise around a shaft 8a by a locking lever spring 9 whose one end is fixed to the camera body 1. In the lock mode shown in FIG. The rotational force is blocked by engagement between a locking pawl 8c and a tensioner 10e, which will be described later, and in other modes, the tension lever protrusion 7a at the right end of the mode selection lever 7 and the bent portion 8b at one end of the strobe tensioning lever 8. and are always in a state of confrontation. In the standard photography mode or the telephoto photography mode, the strobe tensioning lever 8 can be rotated counterclockwise by the tensioning lever protrusion 7a pushing the bent portion 8b to the right. The lower part of the light emitter 10 is an elongated plate-like leg 1 having an elongated hole 10c that loosely fits into a pin 10b planted on the side of the camera body 1.
0a, and one end of this leg 10a is attached to the camera body 1.
The leg 10a is biased upward by a pop spring 11 fixed to the side, and a cutout-shaped tension member 10e is provided at the upper part of this leg 10a. The light emitting device 10 is held in a pop-down position as shown in FIG. 2 so that the light emitting device 10 is housed in the camera body 1 by engaging with the locking claw 8c.

12 is a shaft 12 fixed to the camera body 1 side.
The lock lever is rotatable around b as the center of rotation, and is biased counterclockwise by the bias of a lock lever spring 13 that is similarly fixed at one end, and is provided at the lower right side of the mode selection lever 7. For example, the mode selection lever 7 is located directly below the movement of the two cutout-shaped clicks 7b and 7c, and is engaged with the clicks 7b or 7c to lock the mode selection lever 7 in either the standard shooting mode or the telephoto shooting mode. A chevron-shaped lock pawl 12a is provided. Further, the lower part of the light emitter 10 is provided with a protruding reset button 10d extending downward, together with the leg 10a, and corresponding to this reset button 10d, the other end of the lock lever 12 is provided with a push portion 12c extending upward. The engagement between either of the clicks 7b, 7c and the lock pawl 12a is such that the push portion 12c is connected to the reset button 10.
d, the lock lever 12 is rotated clockwise and released. In addition, the lock claw 12a and the click 7b
Alternatively, the relationship with 7c is such that by appropriately selecting the inclination angle of these when they engage, they can be switched and engaged by operating the operating member 5 laterally from the outside, and the camera can be used for standard shooting. It can be held in either mode or telephoto shooting mode. As mentioned above, the role of the lock lever 12 is to hold the mode selection lever 7 in the standard shooting mode or telephoto shooting mode, and to hold the mode selection lever 7 in the standard shooting mode or telephoto shooting mode.
0 is pushed in (pop-down), the engagement between the lock pawl 12a and the click 7b or 7c is released, and the mode selection lever 7 is returned to the lock mode position by the force of the mode selection lever spring 6.

The finder 4 is a mark-type finder consisting of an objective lens 4a, an eyepiece lens 4b, a half mirror 4c, a mirror 4d, and a frame mask 4e.
(Lock mode), W (Standard shooting mode), and T (Telephoto shooting mode) symbol marks are attached in a row in the horizontal direction, and are selected in the viewfinder 4 by a protruding indicator 7e provided on the mode selection lever 7. The shooting mode etc. can be checked visually. These symbol marks are also placed on the camera body 1 side on the operating member 5. A movable lens barrel 14 that slides within the lens barrel 2 in the optical axis direction.
A motor 15 is provided in the camera body 1 as a drive source, and this driving force rotates a feed screw 19 via gears 16, 17, and 18, and the movable lens barrel 14 side, through which this screw 19 is threaded, rotates a feed screw 19. The signal is transmitted to a fin-shaped screw receiving portion 14a provided in the fin-like screw receiving portion 14a. The movable lens barrel 14 is extended or retracted by forward or reverse rotation of the motor 15.

21 detects whether the position of the movable lens barrel 14 is either the telephoto shooting mode position (extended position) or the standard shooting mode position (retracted position), and moves the movable lens barrel 14 to the selected shooting mode. This is a second switch for energizing the motor 15 until the motor 15 reaches the extended or retracted position depending on the position. As will be described later, this second switch 21 is composed of a three-pronged section 211 fixed to the movable lens barrel 14 side and a switch pattern group made of copper foil or the like on a printed circuit board provided on the lens barrel 2 side. The second switch 21 is opened and closed by sliding this piece 211 over the switch pattern group. The energization of the motor 15 is carried out by the aforementioned first switch 2 which determines the direction of energization of the motor 15 in conjunction with the movement of the second switch 21 and the operating member 5.
0 as described below.

The above-mentioned switch 22 turns on the switch that charges the light emitter 10 when shooting is possible, changes the amount of light emitted from the light emitter 10 in each mode of standard shooting and telephoto shooting mode, or controls the exposure control mechanism to a predetermined value. This is a switch that outputs a signal to correspond to changes in the F-number value with respect to the aperture diameter for each mode, and since this switch is not an essential part of the present invention, detailed explanation will be omitted.

Reference numeral 23 denotes the above-mentioned lens barrier, which is implanted in the front surface of the movable lens barrel 14 and is rotatable within the movable lens barrel 14 around the pin 23b as a center of rotation, and has one end fixed to the movable lens barrel 14 side using a barrier spring. 24 in the clockwise direction. A mode selection lever 7 is located on the right-angled portion of the lens barrier 23.
A barrier pin 23a protrudes forward from the cam 7d and brings the lens barrier 23 in front of the photographing lens 3 while charging the barrier spring 24 by contacting the inclined surface of the barrier switching cam 7d whose tip protrudes forward toward the right side and is inclined. has been planted. Since the engagement between the barrier pin 23a and the inclined surface of the barrier switching cam 7d is released in modes other than the lock mode, the lens barrier 23 is retracted from the front surface of the photographic lens 3 as shown in FIG. Note that a portion of the lens barrier 23 including the barrier pin 23a and a portion of the barrier switching cam 7d are located in a cavity (not shown) within the lens barrel 2.

FIG. 4 is an explanatory diagram showing the relationship between the click of the mode selection lever and the lock pawl of the lock lever. In the figure, the lock pawl 12a has a chevron-shaped sloped portion, and the right side of the sloped portion has a vertical wall portion 12l. The click 7b has a notch shape similar to the shape of the lock pawl 12a, and the wall portion 7b has a notch shape similar to the shape of the lock pawl 12a.
It has l. Further, the shape of the click 7c is a notched chevron shape similar to the shape of the chevron-shaped portion of the lock pawl 12a.

Switching from lock mode to standard shooting mode, from standard shooting mode to telephoto shooting mode, and from telephoto shooting mode to standard shooting mode can be done by manually moving the operating member 5 to the left or right. Switching from the standard shooting mode or the telephoto shooting mode to the lock mode using the operating member 5 is performed when the wall 7l of the click 7b and the wall 12l of the locking claw 12a abut against each other.
This is not possible because the locking is done by 2a.
Next, the operation of the camera according to the present invention will be explained with reference to FIGS. 1 to 4. When the camera is in lock mode, the camera is in the state shown in FIG. In this state, the mode selection lever 7 is positioned to the left by the force of the mode selection lever spring 6.
In this position, the tension lever protrusion 7a is also located on the left side, and the strobe tension lever 8 is biased clockwise by the force of the tension lever spring 9 until the tension lever protrusion 7a abuts against the strobe tension lever 8. The locking claw 8c is used to secure the leg 10a of the light emitter 10.
, and holds the light emitter 10 pop-down as described above. In addition, the movable lens barrel 14 is
The lens barrier 23 is in the retracted position, and the pin 23a and the barrier switching cam 7d are engaged, so that the lens barrier 23 covers the front surface of the photographing lens 3.

Next, the operation when switching from the lock mode to the standard shooting mode will be explained. The operating member 5 is manually moved to the right along with the mode selection lever 7 against the force of the mode selection lever spring 6 and the clockwise rotational force of the tension lever 8 pushed by the tension lever spring 9. Along with this movement, the tension lever protrusion 7a pushes the bent portion 8b of the strobe tension lever 8 to the right against the force of the tension lever spring 9. As a result, the locking claw 8c of the strobe locking lever 8 is attached to the shaft 8.
It rotates counterclockwise around a as the center of rotation, and the engagement between the locking pawl 8c and the tensioner 10e is released. At this time, due to the upward bias of the pop spring 11, the light emitting device 10 is moved together with its legs 10a and its light emitting portion 10c.
is pushed up until it appears at the top of the camera body 1 as shown in FIG. 3 and pops up. As the light emitter 10 moves upward, the lock lever 12 rotates clockwise together with the lock pawl 12a due to the bias of the lock lever spring 13, and the lock pawl 12a bites into the click 7b so that they are engaged. At this time, since the operating member 5 is positioned at the standard photographing mode position, manual movement of the operating member 5 is stopped.

On the other hand, when the first switch 20 is switched from the lock mode to the standard shooting mode, the motor 15 is not energized as described later, and the movable lens barrel 14 holding the shooting lens 3 is moved to the position in the lock mode. It remains in the same position without moving. In addition, as the mode selection lever 7 moves to the right as described above, the barrier switching cam 7d also moves to the right, so that the engagement between the cam 7d and the barrier pin 23a is released. As a result, the lens barrier 23 is rotated clockwise due to the restoring force of the barrier spring 24, and the photographing lens 23 is rotated as shown in FIG.
Since it is evacuated from above, the camera is in a state where it can take standard pictures.

Next, the state of the camera when switching from standard photography mode to telephoto photography mode will be explained. The operating member 5 is manually moved to the right together with the mode selection lever 7 against the force of the mode selection lever spring 6, the tension lever spring 9, and the engagement force between the lock pawl 12a and the click 7b. At this time, the lock pawl 12a climbs over the inclined surface of the click 7b due to the clockwise rotation of the lock lever 12, and then the click 7c bites into the lock lever 12 due to the counterclockwise rotation of the lock lever 12 due to the biasing force of the lock lever spring 13. engage. Just when this engagement took place,
The mode selection lever 7 is in a position fully moved to the right when the camera is switched from the standard photography mode to the telephoto photography mode. As the mode selection lever 7 moves to the right, the first switch 20 is switched as described later, and the motor 15 is energized. The motor 15 rotates in the forward direction, and this rotational driving force is transmitted to the feed screw 19 via the gears 16, 17, and 18, and the movement of the screw receiver 14a due to the rotation of the screw 19 moves the movable lens barrel 1.
4 is extended along the optical axis to the front side of the camera together with the photographic lens 3. Just when the photographing lens 3 reaches the telephoto shooting mode position, the second switch 21 is switched as described later to stop energizing the motor 15, and the photographing lens 3 is positioned to enable telephoto shooting. The state will be as follows.

On the contrary, the operation when the camera is switched from the telephoto shooting mode shown in FIG. 3 to the standard shooting mode will be described. The operating member 5 is manually switched from the telephoto shooting mode shown in FIG. 3 to the standard shooting mode position to the left. Along with this movement of the operating member 5, the protrusion 7h of the mode selection lever 7 also moves to the left together with the first and second sections 201, 202 of the first switch 20, and the first switch 20 is switched as described below. . At this time, the motor 15 is energized and rotates in reverse, and this rotational force is applied to the gears 16, 17, 1.
8 and feed screw 19, the movable lens barrel 14 is retracted along the optical axis to the rear of the camera to the retracted position shown in FIG. 2, and the camera is placed in a state ready for standard photography.

Next, the operation when the camera is switched from the telephoto shooting mode shown in FIG. 3 to the lock mode shown in FIG. 2 will be described. As shown in FIG. 3, a force is applied to the pop-up head of the light emitting device 10 to push it down against the force of the pop spring 11. Then, the light emitter 10 is popped down to the position shown in FIG. At this time, the reset button 10d of the light emitter 10 is locked on the lock lever 12.
hit the pusher part 12c and press it down.
As a result, the lock lever 12 rotates clockwise together with its lock pawl 12a against the counterclockwise bias of the lock lever spring 13, and the engagement between the lock pawl 12a and the click 7c is released. Ru. When this engagement is released, the mode selection lever 7 moves fully to the left together with the operating member 5 due to the restoring force of the mode selection lever spring 6 and the tension lever spring 9. At this time, the tension lever protrusion 7a is
The bent portion 8b is no longer pressed, and the strobe tensioning lever 8 rotates clockwise together with its locking claw 8c due to the restoring force of the tensioning lever spring 9. As a result, the locking pawl 8c and the tensioner 10e engage with each other, and the light emitter 10 is held in the pop-down state against the force of the pop spring 11.

On the other hand, by moving the protrusion 7h of the mode selection lever 7 to the left to the lock mode position, the first switch 20 is switched as described later. This switched first switch 20 and the second switch 20 switched in the telephoto shooting mode position as shown in FIG.
As will be described later, the motor 15 is energized by its relationship with the switch 21. The motor 15 rotates in the reverse direction to move the movable lens barrel 14 together with the photographic lens 3 to the rear of the camera to the position shown in FIG. 2, that is, to the standard photographing mode position (lock mode position) as described above. When the movable lens barrel 14 is retracted, the barrier pin 23a comes into contact with the slope of the barrier switching cam 7d, and when the barrier pin 23a is guided along the slope, a counterclockwise force is applied to the lens barrier 23. Then, while charging the barrier spring 24, the lens barrier 23 rotates counterclockwise and closes so as to cover the front surface of the photographic lens 3. As described above, the light emitter 10 is popped down and the lens barrier 23 covers the front surface of the photographic lens 3, thereby keeping the camera in a locked state.

Also, although I did not explain the operation of switching from lock mode to telephoto shooting mode, it is obvious from the operation when switching from lock mode to standard shooting mode and from standard shooting mode to telephoto shooting mode. , the explanation of this operation will be omitted. Furthermore, when switching from the standard photographing mode to the lock mode, the operation is almost the same as that for switching from the telephoto photographing mode to the lock mode, except for the movement of the movable lens barrel 14, and the explanation of the operation will be omitted. However, the mode selection lever 7 is moved to the left together with the barrier switching cam 7d by the mode selection lever spring 6, and at this time, the barrier switching cam 7d pushes the barrier pin 23a to the left. Thereby, the lens barrier 23 is closed against the force of the barrier spring 24.

Note that when switching from the telephoto shooting mode or the standard shooting mode to the lock mode, the switching is not possible even if the operating member 5 is operated. This is because, in the standard shooting mode, the lock pawl 12a and the click 7b engage, and these wall portions 12l, 7l abut and lock against each other, so that even if the operating member 5 is not forced any further to the left by hand, This is because the operating member 5 and the mode selection lever 7 do not move to the left lock mode position even when the user tries to move the operating member 5 and the mode selection lever 7 by adding the following. Therefore, these changes can be made simply by pushing the light emitter 10 as described above.

Although the viewfinder 4 has not been explained in the above explanation, the index 7e is positioned according to the positioning of the operating member 5 to each mode position, and the mode is clearly indicated according to the state of the selected mode. Therefore, L, W, on the frame mask
An indicator 7e points to one of the T symbol marks. Therefore, when switching the operating member 5, it is only necessary to visually confirm which mode the mode is in through the viewfinder 4 while switching the operating member 5.

Next, a circuit for extending and retracting the movable lens barrel 14 will be explained using FIG. 5.
Reference numeral 20 designates the aforementioned first switch, which consists of two bifurcated sections 201 and 202 that move integrally and first to sixth switch patterns 203 to 208, including the first and fourth switch patterns 203. ,206
is the lock mode position (position L in the illustration, below)
It is abbreviated as L position. ) to the telephoto shooting mode position (position T in the diagram, hereinafter abbreviated as T position).
Up to 20 patterns for the second and fifth switches
4, 207 are from the L position to the standard shooting mode position (the W position in the figure, hereinafter abbreviated as the W position), and are the third and sixth switch patterns 20.
5 and 208 are located at T positions on the extensions of the second and fifth switch patterns 204 and 207, respectively. Here, the first section 201 includes a first switch pattern 203 and a second switch pattern 204.
and the third switch pattern 205,
The second section 202 is the fourth switch pattern 2
06, the first switch 20 is opened and closed by sliding on the fifth switch pattern 207 and the sixth switch pattern 208.

21 is the second switch mentioned above, and the third switch with three prongs.
consists of a section 211 and seventh to ninth switch patterns 212 to 214, the seventh switch pattern 212 extends from the movable lens barrel extension position to the movable lens barrel retraction position, and the eighth switch pattern 2
13 extends from the movable lens barrel extended position to the movable lens barrel retracted position, and the ninth switch pattern 214 extends from the movable lens barrel retracted position to just before the movable lens barrel extended position. Note that the movable lens barrel extended position of the switch pattern means that the third section 211 comes into contact with the switch pattern at this position when the movable lens barrel is completely extended. The position of the movable lens barrel in the pattern can be similarly interpreted. Note that the second switch 21
is opened and closed using the seventh to ninth switch patterns 212.
This is done by sliding the third section 201 over the area 214.

Here, the first switch pattern 203 and the fourth switch pattern 206 are the power source battery 25
The second and sixth switch patterns 204 and 208 are connected to the seventh and ninth switch patterns 212 and 214, respectively, and the third and fifth switch patterns 205 and 207 are connected in common. The eighth switch pattern 213 is connected to one terminal of the motor 15, and the eighth switch pattern 213 is connected to the other terminal of the motor 15. In lock mode, the first switch 2
The first and second intercepts 201 and 202 of 0 are at the L position,
That is, it is the position shown by the solid line in the figure, and the third section 2
11 is located at the retracted position of the movable lens barrel as shown by the solid line in the figure. Therefore, in this state, the third section 21
Since the contact between the first and seventh switch patterns 212 is broken, the motor 15 is not energized.

Even if the camera is changed from the lock mode to the standard shooting mode by switching the operating members as described above, the first and second slices 201 and 202 are only moved from the L position to the W position, and the first switch 20 at this time The switching state is the same as in lock mode. Therefore, the motor 15 is not energized and the movable lens barrel 1
4 is the same position (the position indicated by the solid line in the figure)
is retained.

Next, when switching the operating member as described above and changing the camera from lock mode or standard shooting mode to telephoto shooting mode, the first and second sections 20
1,202 is located at the position indicated by the dashed line from the L or W position to the T position. Then, power supply battery 25 → first switch pattern 203 → first section 201 → third switch pattern 205 →
Motor 15 (current in direction of arrow A) → 8th switch pattern 213 → 3rd section 211 → 9th switch pattern 214 → 6th switch pattern 208 → 2nd section → 4th switch A closed circuit of pattern 206→power battery 25 is formed, the motor 15 is energized and rotates forward, and the movable lens barrel 14 is extended from the position shown by the solid line to the movable lens barrel extension position shown by the two-dot chain line. When the movable lens barrel 14 moves to this position, the third
As shown by the two-dot chain line, the contact between the segment 211 and the ninth switch pattern 214 is cut off, and the switching path becomes an open circuit, cutting off the power to the motor 15, and the movable lens barrel 14 is cut off. The movement is stopped and the position is determined. Next, when the operating member is switched as described above to change the camera from the telephoto shooting mode to the standard shooting mode or to the lock mode by popping down the light emitter, the first and second slices 201,
202 is switched from the T position shown by the dashed line to the W or L position.

At this time, power supply battery 25 → first switch pattern 203 → first section 201 → second switch pattern 204 → seventh switch pattern 2
12 → third section 211 → eighth switch pattern 213 → motor 15 (current is in the direction of arrow B) →
Fifth switch pattern 207 → second section →
Fourth switch pattern 206 → power battery 25
A closed circuit is formed, the motor 15 is energized and rotates in the reverse direction, and the movable lens barrel 14 is retracted from the position shown by the two-dot chain line to the movable lens barrel retracted position shown by the solid line. When the movable lens barrel 14 is moved to exactly this position, the contact between the third section 211 and the seventh switch pattern 212 is broken, as shown by the solid line at the position of the third section 211. The closed/open circuit becomes an open circuit, the power supply to the motor 15 is cut off, and the movement of the movable lens barrel 14 is stopped and positioned.

Switching from the standard photographing mode to the lock mode by popping down the light emitter is the same as the reverse operation, and as described above, the motor 15 is not energized and there is no change.

In addition, the mark type finder of the above embodiment is as follows:
The L, W, and T symbol marks are indicated by the indicators, but apart from this, a mask indicator 7e provided in the notch is used as shown in Fig. 6 to make only the symbol mark of the selected mode stand out. is also valid.

As described above in detail regarding the embodiments of the present invention,
Switching from lock mode to telephoto shooting mode or standard shooting mode and switching from telephoto shooting mode to standard shooting mode can be easily done with a single operation of a single operating member, significantly improving the operability of the camera. did. Moreover, since each mode is displayed in the viewfinder, you can operate the operating elements while looking at this display.Furthermore, since it is a single operating element operation, there is no need to apply much force to the camera, so you can keep your eyes away from the viewfinder. It is now possible to operate it easily without having to take it off. In addition, the mode switching mechanism can be centralized, which is very advantageous in terms of camera implementation. Furthermore, when opening the lens barrier, the mode can be switched simultaneously by operating the single operating member, thereby significantly improving the operability of the camera.

According to the present invention, when the lens is in the wide-angle position, the lens barrier and the barrier moving member are interlocked, so that the lens barrier can be brought into the closed state by operating the barrier moving member. The lens can be protected during use, and by opening the lens barrier, the lens can be used as a wide-angle lens.Furthermore, when the lens is in the telephoto position, the lens barrier and barrier moving member can be This has the effect that the lens can be used as a telephoto lens by cutting off the linkage with the lens.

[Brief explanation of the drawing]

Fig. 1 is an external view of a camera which is an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the main mechanism of the camera which is an embodiment of the invention in lock mode, and Fig. 3 is an embodiment of the invention. FIG. 4 is an explanatory diagram of the relationship between the lock claw and the click, and FIG. 5 is an explanatory diagram of the motor drive circuit of the camera according to the embodiment of the present invention. 6 are explanatory diagrams of other embodiments of the mark type finder. 1 is the camera body, 2 is the lens barrel, 3 is the photographic lens,
4 is a mark type finder, 5 is an operating member, 7,
7' is the mode selection lever, 7b and 7c are clicks,
7d is a barrier switching cam, 8 is a strobe tension lever, 10 is a light emitter, 10d is a reset button, 1
2a is a lock claw, 14 is a movable lens barrel, 15 is a motor, 20, 20' is a first switch, 21, 2
1' is the second switch, 23 is the lens barrier, 2
3a is a barrier pin, and 24 is a barrier spring.

Claims (1)

[Scope of Claims] 1. The lens constituting the photographic optical system is moved from the wide-angle side to the front of the optical axis to change the focal length to the telephoto side, and the lens is moved from the telephoto side to the rear of the optical axis to change the focal length. In a focal length switching camera that changes the focal length toward a wide-angle side, the lens is moved in the optical axis direction by using a motor as a drive source to move a movable lens barrel holding the lens inside in the optical axis direction. a lens moving mechanism for adjusting the lens position; a lens position selection member for selecting one of a first state in which the lens is placed in a wide-angle position and a second state in which the lens is placed in a telephoto position; a detection means for detecting a selected state of the selection member; and when the detection means detects that the selection of the lens position selection member is in the first state, the motor is driven to move the lens. When the lens is moved to the wide-angle position and the detection means detects that the selection of the lens position selection member is in the second state, the motor is driven to move the lens to the telephoto position. a lens barrier movably supported by the movable lens barrel and movable between a closed position covering the optical axis direction of the lens and an open position retracting from in front of the optical axis of the lens; and a camera body. a barrier moving member that is provided in the lens barrier and moves the lens barrier to one of the closed position and the open position; and when the lens is in the wide-angle position, the lens barrier and the barrier moving member to move the lens barrier to one of the closed position and the open position in response to the operation of the barrier moving member, and when the lens is at the telephoto position, A focal length switching type camera characterized by being provided with interlocking means for cutting off interlocking between the lens barrier and the barrier moving member.