JPH02234142A - Variable power mechanism for camera - Google Patents

Abstract

PURPOSE:To make a camera inexpensive and to miniaturize the camera without complexing the control circuit of a motor by normally and reversely rotating a driven side rotary members by the unidirectional rotation of the motor. CONSTITUTION:The driven side rotary member 13 is directly or indirectly connected with a driving side rotary member 11 connected with the motor 7, via other driven side rotary member 14, etc., so that the driven side rotary member 13 is normally and reversely rotated by the unidirectional rotation of the motor 7. Therefore, the normal and reverse rotation of the motor 7 is not needed, and four switching means and the two output ports of a camera microcomputer 6 for operating them are also not needed. Thus, the control circuit of the motor 7 is not complexed, the price is lowered, and a camera is miniaturized.

Description

[Detailed Description of the Invention] The present invention provides a camera having at least two photographic lens systems with different focal lengths or photographing distances, in which the direction of rotation of the motor is switched in one direction. Regarding the variable magnification mechanism of the camera.

2. Description of the Related Art Hitherto, various structures of variable magnification mechanisms for cameras of this type have been known. For example, FIG. 13 shows a schematic diagram of a switching mechanism used in an exemplary magnification variable mechanism. In the figure, since the lens switching operation is a reciprocating movement of the lens between the photographing position where the lens is located on the photographing optical path and the retracting position where the lens is retracted from the photographing optical path, the motor M
This was done by using forward and reverse rotations.

Problems to be Solved by the Invention However, in the above-mentioned horizontal construction, the motor M and the lens side are always connected by gears, so the motor M needs to rotate in both forward and reverse directions. Therefore, in order to cause the motor M to rotate in the forward or reverse direction, at least four switching means (usually transistors) S. ..., S are required, and these switching means S,...
・．． Two or more output ports of the camera microcomputer C are required to operate S, which makes the control circuit complicated and expensive.

On the other hand, conventionally, as shown in FIG.
0-45214). That is, in this method, a lens barrel D is provided with a plurality of lenses F and G, and this lens barrel D
is connected to a motor M via a gear reduction mechanism 11, and the lens barrel D is rotated via the reduction mechanism I2 in the forward direction of the motor M, thereby switching between the lenses F and G.

However, with this method, each lens must rotate 360 degrees together with the lens barrel for switching, and a large space is required within the camera for the lenses to rotate together with the lens barrel, resulting in an increase in the size of the camera. There was a problem with the storage.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a variable magnification mechanism for a camera that does not make the motor control circuit complicated, is inexpensive, and allows the camera to be made smaller. It is in.

Means for Solving the Problems In order to achieve the above object, the present invention provides at least two driven side rotating members for a driving side rotating member connected to a motor, so that the driving side rotating member has at least two driven side rotating members. By connecting one driven side rotating member directly and indirectly via the other driven side rotating member, rotation of the motor in one direction causes the one driven side to be connected directly and indirectly through the other driven side rotating member. The rotating member is configured to rotate in forward and reverse directions.

That is, according to the first configuration of the present invention, the drive-side rotation member, the first driven-side rotation member, and the second driven-side rotation member are connected to the motor, and the drive-side rotation member and the first drive-side rotation member are connected to the motor. The driving force can be transmitted between the first driven rotating member and the second driven rotating member only in the first section of the rotation angle of the driving rotating member. The transmission of the driving force between the first driven rotating member and the second rotating member is possible only in a second section of the rotation angle of the driving side rotating member that does not overlap with the first section. The driving force is always transmitted to and from the driven rotating member.

Further, according to the second configuration of the present invention, the driving side rotating member, the first driven side rotating member, and the second driven side rotating member are provided, and the driving side turning member and the first driven side rotating member are provided. Transmission of driving force between the rotating member is always carried out, and transmission of driving force between the driving side rotating member and the second driven side rotating member is as follows.
This is possible only in a predetermined range of the rotation angle of the drive-side rotating member, and the above-mentioned No. 1! The groove is formed so that transmission of driving force between the driven rotating member and the second driven rotating member is possible only in another section that does not overlap with the predetermined section of the driving rotating member. .

Further, in the above configuration, each stopper that regulates a predetermined rotational position of each of the first driven rotational member and the second driven rotational member, and each of the driven rotational members are connected to each of the stoppers. It may also be configured to include snap springs that bias the springs into engagement.

Further, in the above configuration, a stopper that restricts a predetermined rotational position of the second driven rotating member and a snap spring that biases the second driven rotating member to engage with the stop flange are provided. It can also be assembled to have

Furthermore, in the above configuration, at the predetermined rotational position,
It is also possible to change the configuration so that the predetermined lens is positioned at the photographing position or the retracted position with respect to the photographing optical path.

In the first configuration, when the drive-side rotating member is driven by the motor, in the first section, the driving-side rotating member is connected to the first driven-side rotating member and driven. The horn is transmitted, and the first driven rotating member rotates in a predetermined direction. Further, when the drive-side rotating member rotates and enters the second section, the drive-side rotating member and the first
The second driven rotating member is disconnected from the driven rotating member, and the second driven rotating member is coupled to the -L period driving rotating member, and the second driven rotating member is rotated in a fixed direction. At this time, the first driven rotating member, which is always connected to the second driven rotating member, rotates in a direction opposite to the predetermined direction. Therefore,
The first driven rotating member is rotated forward and backward by the rotation of the motor in one direction.

Further, in the second configuration, when the driving side rotating member is driven by the drive of the motor, the first driven side rotating member also rotates, and in the predetermined section of the driving side rotating member, the driving side rotating member is rotated by the first driven side rotating member. 2. The second driven rotating member is connected to the second driven rotating member.
vi A driving force is transmitted to the driving side rotating member, and the second driven side rotating member rotates in a predetermined direction. Further, when the drive-side turning member rotates and reaches the other section, the first driven-side rotation member that is connected to and rotates the drive-side rotation member changes to the second driven-side rotation member. The second driven rotating member rotates in a direction opposite to the predetermined direction. Therefore, the second driven rotating member is rotated forward and backward by the rotation of the motor in one direction.

Further, in the configuration including a stopper and a snap spring, when the first driven rotating member or the second driven rotating member engages with the stopper due to the biasing force of the snap spring, the rotational position of each member changes. regulated and stops at a predetermined rotational position.

Furthermore, if the predetermined rotational position is a position for positioning the predetermined lens in the photographing position or the retracted position with respect to the photographing optical path, each rotary member is stopped at the predetermined rotational position, so that the predetermined lens is moved. The lens can be positioned within the photographing optical path or outside the photographing optical path, and the magnification can be changed by rotating the motor in one direction.

Effects of the Invention According to the above configuration, by connecting the driving side rotating member directly and indirectly via another driven side rotating member to the driving side rotating member connected to the motor. ,
The rotation of the driven side rotating member in one direction can cause the driven rotating member to rotate in the forward and reverse directions. Therefore, there is no need to rotate the motor forward or backward, there is no need for four switching means or two output ports of the camera microcomputer to operate these switching means, and the motor control circuit is not complicated and is inexpensive. Become something.

In addition, since the lens can be moved in and out of the photographing optical path by forward and reverse rotation of the driven rotating member, there is no need to rotate the lens supporting member, such as the lens barrel, through 360 degrees, and the size of the camera can be reduced. can be achieved.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1-12.

The variable magnification mechanism of the camera according to this embodiment is shown in FIG. 12, and since this embodiment uses a toothless gear train, reciprocating rotational motion can be obtained only by rotating the motor 7 in the forward direction. It's a bastard. Further, as a modification of this example, the rotation of the motor 7 in the opposite direction, which is no longer necessary for lens switching, can be used as a drive actuator for another mechanism, that is, a drive actuator for a barrier opening/closing drive mechanism.

In the following, an electronic still camera equipped with the above-mentioned embodiments and modified examples will be explained as an example.

FIGS. 1(a) to 1(e) show external views of an electronic still camera which is an embodiment of the present invention. As shown in FIG. 1(C), the front of the camera includes a flash 70, a photometer 80, a viewfinder 40, and a lens barrier 58 in normal conditions.
The visible lens aperture is located. Figure 1 (
As shown in b), a release switch 5, a telephoto switch 3 for changing lenses, and a close-up switch 4 are arranged on the top surface of the camera. Also, as shown in Figure 1(a), 1! A main switch 90 is located to turn the power on or off. Inside the camera, an image sensor 25 is arranged behind the lens barrier 58 via a photographing lens system, and the image taken by the image sensor 25 is processed and then transferred to a floppy disk set in the camera by a decker 80. recorded on the disc.

FIG. 1(f) shows a system diagram of the camera of this embodiment. In this figure, a lens barrier drive section and a lens rear block 2, which will be described later, are omitted for the sake of simplification. The photographic lens system of this embodiment includes two main optical systems A(lg).
When the front lens block l that holds B (lb) and the main optical system B (lb) are in the photographing optical path (optical path center It consists of a rear lens block 2 that holds a sub-optical system C (2c) that is inserted and removed.

These two blocks 1.2 are rotatably supported by a lens rotation shaft 22 within a range of 90 degrees, and both blocks 1.2
Tora snap spring 1 6.1 0° or 9 depending on 7
It is pressed and fixed at the 0゛ position.

As shown in Table 1, the photographic optical system of this embodiment can be used as three different types of photographic lenses depending on the positions of the front lens block I and the rear lens block 2. Figure 2 is a model representation of the photographic optical system in each state.
FIG. 2(a) shows the state of the wide-angle lens, FIG. 2(b) shows the state of the telephoto lens, and FIG. 2(C) shows the state of the close-up lens.

Table 1 In this example, the photographing lens has a fixed focus in each of the three states, the wide-angle lens is f9/F3.5, the telephoto lens is r20/F3.5, and the close-up lens is [2
0/F 1 6. F with close-up lens
The reason for increasing the number is to widen the depth of field, and since the possible shooting distance # (focusing distance M) is short, the flash can be used to shoot when there is insufficient illumination. I try to do it. FIG. 3 shows the distance that can be photographed with each lens and the screen ratio when photographing a person.

In this embodiment, since the photographing lens has a wide-angle lens in a standard state of deafness, two operating members, a telephoto switch 3 and a close-up switch 4, are provided as operating members for changing the magnification. When these operation switches are operated, the photographic lens is switched from the wide-angle lens state to each state, and when the operation of the operation switches 3.4 is stopped, the wide-angle lens state is returned again.

Further, when the photographing lens is a telephoto lens or a close-up lens and the release switch 5 is turned on to take a photograph, the lens automatically returns to the wide-angle lens state after exposure is completed.

Further, a lens barrier 58 (see FIG. 6), which will be described later, opens when the release switch 5 is turned on to prevent burn-in of the image sensor 25, and closes after exposure is completed.

That is, in this embodiment, an image sensor that can control the start and end of charge accumulation is used as the image sensor 25, and the appropriate exposure can be adjusted by changing the accumulation time without using a light adjusting means such as an aperture. It doesn't have an aperture because it can. For that reason, Lens Barrier 5
If the lens barrier 8 is open all the time, image capture will occur in the image sensor 25 when strong external light is incident, so the lens barrier 58 is opened only during exposure.

Now, the switching operation from the wide-angle lens state to the telephoto lens state will be explained (see FIG. 1(J) and FIG. 4). The step numbers in the text are the step numbers in the flowchart of FIG. As shown in FIG. 11(a), when the photographer turns on the telephoto switch 3 (step S I 0 1), the motor 7 starts to rotate normally by the camera microcomputer 6 (step S102). Here, a worm gear 7a is attached to the motor 7 in this embodiment and in the figures, and the direction in which the reduction gear 8, which is a worm wheel, is rotated in the direction of the arrow in the figure is the normal rotation of the motor 7 and the opposite direction. will be expressed as the reversal of the motor 7.

In addition, for gear trains and rotating bodies other than the motor 7, clockwise rotation represents a forward direction, and counterclockwise rotation represents a reverse direction. When the motor 7 rotates forward in step S+02, the sun gear 9 rotates in the forward direction via the reduction gear 8. When the sun gear 9 rotates in the forward direction, the planetary gear 10 meshes with the input gear lla of the lens switching gear All, which is a four-stage gear, and transmits the rotation, so that the lens switching gear All also rotates in the forward direction. The lens switching gear All is provided with a thousand lens state detection stages l2, and during one rotation of the lens switching gear All, 4' signals representing three states are outputted from the lens state detection means l2.

FIG. 5(a) shows a pattern diagram of a patterned substrate 12a which is one element of the lens state detection stage 12 of this embodiment. The lens state detection means 12 detects pattern + (12-1) and pattern 2 (1 2
-2) and the GND line (12-0) to obtain a signal. Lens condition detection means 12
With the rotation angle of -] on the horizontal axis, the GND line (12-0)
When there is continuity, it is the Co signal, and when there is no continuity, it is 1-1.
The model diagram of the timing chart as the i signal is shown in the fifth figure.
The relationship between each lens pattern and each lens state is summarized in Table 2.

As can be seen from Table 2, Figure 5 (b), the status signals of the wide-angle lens, telephoto lens, and close-up lens are output approximately every 120° (three equal parts of one rotation), and each status signal is output. Since the interval is narrower than the interval in which the lens is in each state, the photographing lens is always in that state when each state signal is output.

In the state of the close-up lens, as shown in FIG. 5(b), the section where lens pattern 2 (+2-2) becomes [50] is widened. This is related to the operation of returning to the wide-angle lens state in the lens switching operation, which will be described later, but will be briefly explained here. If lens pattern l(+2-
If the ranges of 1) and lens pattern 2 (+2-2) are set to be exactly the same, there will be a relative position error between the lens pattern board 12a and the intercept +2b, a pattern error on the pattern board 12a, an error in the intercept +2b, etc. Therefore, it is possible that a signal indicating the deafness of the wide-angle lens, that is, a signal of Lo for lens pattern + (12-1) and a signal of Ili for lens pattern 2 (+2-2), may be output, leading to malfunction, so close On both sides of the section where the up lens status signal is output, there are sections where the telephoto lens status signal is output to prevent malfunctions.

Furthermore, the reason why there is a wide range in the pattern of outputting each status signal is that it takes a certain amount of time from when the signal is output from the lens status detection means 12 until the motor 7 stops, and also when the motor 7 stops, the lens This is to ensure that the same status signal is output from the status detection means.

The lens switching operation will be described below with reference to FIG. Figure 4(b),(d). (r). (h), (j). (1)
4(c) respectively show the operation of the front lens block 1, and FIG.
)． (e). (g). (i). (k)
．． (m) shows the operation of the rear lens block 2, respectively.

By normal rotation of the motor 7 as described above, the lens switching gear All
rotates in the forward direction, and the lens condition detection means! 2 outputs the telephoto signal to the camera microcomputer 6 (step Sl
03, SI04), the motor 7 is stopped by the camera microcomputer 6 (step Sl05). At this time, the segment 12b stops at a point of about 120'' on the lens pattern board 12a, indicating the telephoto lens state.The lens switching gear All and the lens switching gear Cl4 are both partially toothed gears, and are used for wide-angle lenses. In the state (Fig. 4(b) and (c)), there is no gear connection, but when the lens switching gear All starts rotating, the gear portion 11b meshes with the gear portion l4c,
The lens switching gear All and the lens switching gear CI4 begin to engage (FIG. 4(d) and (e)), and the gear portions 11b and 14c are disengaged before the motor 7 stops. Here, it is the i-th output gear portion 11b of the lens switching gear All, which is a four-stage gear, that transmits meshing rotation from the lens switching gear All to the lens switching gear Cl4 (see FIG. 4(a)). When the lens switching gear Cl4 rotates, the front lens block 1 rotates around the lens rotation axis 22 due to the engagement between the first gear 14a of the gear C14 and the gear portion 1d of the lens movable block 1. A biasing force is applied to this lens front block 1 by a snap spring A16, but when the lens switching gear A11 and lens switching gear Cl4 are disengaged,
The lens front block 1 is rotated to such an extent that the direction of the biasing force is reversed. Therefore, the snap spring A16 exerts an urging force on the lens front block 1 to suppress and fix the block 1 to the lens positioning B24. Therefore, the photographic lens is switched to a telephoto lens, and the lens front block L and gear section Ld. The lens switching gear C14, which is always connected through gear l4a, is also fixed at the position shown in FIG. 4 (D.(g)).

In addition, lens switching gear CI4 and lens switching gear 1313
Both are always connected in gear via the second gear part 14b and the first gear part 13a and are fixed at the positions shown in FIG. 4+4) and (g).

Next, the switching operation from the wide-angle lens state to the close-up lens state will be described. When the photographer turns on the close-up switch 4 (step S201)
, the camera microcomputer 6 causes the motor 7 to start rotating in the normal direction, similar to the switching operation to the telephoto lens state (step S20).
2). Then, similarly to the switching operation from the wide-angle lens state to the close-up lens state, the lens switching gear Al
l rotates in the forward direction. In this case, the motor 7 continues to rotate until a close-up signal is output from the lens state detection stage l2. That is, the patterned substrate 12
The two rotations are continued until section +2b slides on section a and stops at a position of about 240 degrees.

Similar to the switching operation from the wide-angle lens state to the telephoto lens state, until the telephoto signal is output from the lens state detection means 12, only the front lens block I is rotated, and the main optical system of the photographing lens is rotated. is switched to the main optical system B (Ib). Thereafter, during the rotation until the close-up signal is output, as shown in FIG. 4(h). By the meshing operation with the second output gear part 11c of the lens switching gear All and the second gear 15b of the lens switching gear C'15 as shown in (i), the first gear 15a of the lens switching gear C'15 is The rear lens block 2, which is gear-coupled with the rear lens block 2 through the gear portion 2d, rotates by the rotation of the lens switching gear C'l5. When the gears 15a and 2d are disengaged, the snap spring B17 presses and fixes the lens rear block 2 to the lens positioning B24, resulting in the state shown in FIGS. 4(j) and 4(k), that is, the lens rear block 2 is The block 2 is now switched to the 90° position. A close-up signal is outputted from the lens condition detection means 12 after a minute time has elapsed after the gears l5a and 2d are disengaged (steps S203 and S2).
04), the motor 7 is stopped (step S205). Through the above operation, the rear lens block 2 is switched to the 90° position, and the sub optical system C (2c) is inserted into the image sensor side of the main optical system B (1 b), thereby switching to the close-up lens state. The operation is complete.

The following describes the operation when the photographer cancels (turns off) the operation of the telephoto switch 3 after switching the photographic lens to the telephoto lens. In other words, the photographer turned the telephoto switch to 3.
When the operation is stopped (step S106), the camera microcomputer 6 causes the motor 7 to start rotating in the normal direction (step S1).
0 7) Lens condition detection means! Rotation continues until the wide-angle signal is output from 2. Because of this operation, it is necessary to devise a pattern for the close-up lens state of the lens state detection means 12 mentioned above. As the motor 7 continues to rotate, the lens switching gear All rotates in the forward direction from the 120° position to the 360° (0°) position.
Both gear portions 11c of lens switching gear All and lens switching gear C'+5 as described above. After passing through the state in which the photographing lens is switched to the close-up lens state (FIG. 4(j).(k)) by the engagement operation of I5b, the state shown in FIG. 4(1). (m) Lens switching gear A (1
1) third output gear section 11d and lens switching gear [3
The lens switching gear B13 rotates in the opposite direction due to the meshing of the second gear portion +3b. Therefore, since the lens switching gear CI4, which is always connected in gear via the lens switching gear 313 and the gears 13a and 14b, is rotated in the forward direction, the gear portion 14a of the lens switching gear CI4 and the lens front block 1 Through engagement with the gear ring 1cl, the lens moe block 1 rotates in the opposite direction of the switching operation from the wide-angle lens to the telephoto lens. Here again, when the lens switching gear All and the lens switching gear [ ] 13 are disengaged from the gear parts +1d and 13b, the lens front block I is held in position by being suppressed and fixed to the lens positioning A23 by the snap spring AI6. is fixed and returned to the wide-angle lens state. At this time, a wide-angle signal is output from the lens state detection means 12 (steps Sl0B, S109), and the motor 7 is in a stopped state (step Silo).

According to the above explanation, the rotational force from the motor 7 is applied to both the lens switching gear All and the lens switching gear BI3 +1
The lens front block 1 is
However, in this example,
Block in front of the lens! When returning from the position in the close-up lens state to the position in the wide-angle lens state, the front lens block 1 and the rear lens block 2 are configured in such a shape that the rear lens block 2 is pressed while returning. Block 2 is also returned to the wide-angle lens state,
Lens positioning A2 by snap spring B17
3 and becomes the wide-angle lens state shown in FIGS. 4(b) and 4(c). That is, as shown in FIG. 10, the rear lens block 2 has a standing wall 2ρ, and the standing wall 2Q overlaps the cylindrical portion 1k of the front lens block I in the front-rear direction. Therefore, as the lens moe block 1 moves from FIG. 4(j) to FIG. 4(Q) to FIG. 4(b), the vertical wall 20. The rear lens block 2 also moves from FIG. 4(k) to FIG. 4(m) to FIG. 4(c).

Next, an explanation will be given of the operation when the photographer cancels (turns off) the operation of the close-up switch 4 after switching the photographic lens to the close-up lens for deafness. When the photographer stops operating the close-up switch 4 (step S
206), -Similarly to when the operation of the telephoto switch 3 is stopped in the telephoto lens state, the motor 7 continues to rotate in the normal direction until the wide-angle signal is output from the lens state detection means 12 (S207 ). In this case, the meshing operation between the third output gear Ild of the lens switching gear All and the gear 13b of the lens switching gear [{13], which is the same as when the operation of the telephoto switch 4 is stopped in the above-mentioned telephoto lens state, causes the lens front Block 1 and rear lens block 2 are shown in Figure 4(b). The state is returned to the wide-angle lens as shown in (c), and the wide-angle signal is output (step 8208,
S209), the motor 7 stops (step S210).
).

The lens switching operation has been explained above, and the lens switching operation of this embodiment is characterized by a unidirectional loop of wide-angle lens → telephoto lens → close-up lens → wide-angle lens. The lens can be switched simply by rotating the direction.

Next, the operation when photographing will be described below.

First, the photographer presses the release switch 5 while using the wide-angle lens.
The case where the switch is turned on will be explained based on FIG. 11(C).

When the photographer turns on the release switch 5 (step S
301), a signal is input to the camera microcomputer 6, and the camera microcomputer 6 causes the motor 7 to rotate in the opposite direction to that during the lens switching operation (step S302X and subsequent steps are referred to as reverse rotation). Then, the sun gear 9 rotates in the opposite direction via the reduction gear 8, and the planetary gear IO moves away from the lens switching gear All and meshes with the barrier drive gear 5l. Therefore, rotation is transmitted from the planetary gear 10 to the barrier drive gear 5l,
The barrier drive gear 5l rotates in the opposite direction. The barrier drive gear 5l is provided with barrier state detection means 52,
By outputting a barrier open signal to the camera microcomputer 6 at the position of the barrier drive gear 51 corresponding to the barrier open position (
step S303), and stops the motor 7 (step S303).
04), the system starts charge accumulation in the photographing element 25 by generating a barrier open signal (step S305). After the charge accumulation is completed, the camera microcomputer 6 causes the motor 7 to start rotating in reverse again (step 8306), the barrier drive gear 51 also rotates in the opposite direction, and the barrier drive gear 51 corresponding to the barrier closed position is detected by the barrier position detection means 52. A barrier close signal is output at the position (step S307)
As a result, the motor 7 is stopped (step S308).

Hereinafter, the operation of the lens barrier will be briefly explained based on FIG. 6. FIG. 6(a) shows the barrier closed state, and FIG. 6(b) shows the barrier open state. When the barrier drive gear 5l is in the state shown in FIG. 6(a), the barrier close signal is output from the barrier state detection means 52, and when the barrier drive gear 5I is in the state shown in FIG. 6(b). At this time, the barrier-like deafness detection means 52 outputs a barrier open signal. Here, as shown in Table 3 below, the barrier open signal means that the barrier pattern I is Lo and the barrier pattern 2 is tli. Further, the barrier close signal means that the barrier pattern 2 is Lo when the barrier pattern l h<1-1 i.

First, the crank mechanism that opens and closes the barrier will be explained.

The lens barrier 58 is interposed between each lens and the image sensor 25 and acts as a barrier guide between a barrier closed position where it blocks light rays entering the image sensor 25 from the lens and a barrier open position where it is retracted from between both members. Move according to the guidance of 59. That is, the protrusion 5 at the lower end of the Reno's barrier 58 in FIG.
8a moves within the groove of the barrier guide 59,
The lens barrier 58 smoothly moves between the two positions. This lens barrier 58 is always urged toward the barrier closed position by a barrier spring 856. That is, Fig. 6 (g
), the barrier spring 856 is actually a torsion coil spring, and after being charged in the direction of the arrow in FIG. , the other end 56b is locked to the fixing rod.

One end 57d of a barrier drive lever B57 is pivotally attached to the upper end of the lens harrier 58 in FIG. As shown in FIG. 6(e), the other end 57c of this barrier drive lever B57
is pivotally connected to the proximal end 54c of the substantially fan-shaped barrier drive connecting plate 54, and has a protrusion 57a on the lower surface of the intermediate end. The barrier drive connecting plate 54 has a concave i1t54 extending in an arc toward the barrier drive lever on its surface.
a, into which the protrusion 57a of the barrier drive lever B57 is fitted so as to be movable along the groove 54a. One end of the barrier drive lever A53 is pivotally attached to the back surface of the barrier drive connection plate 54 by a pivot pin 54d on the bottom surface of the barrier drive connection plate 54, while the other end of the barrier drive lever A53 is pivoted by a pivot pin 5la. It is pivotally mounted on the upper surface of the barrier drive gear 51. Further, as shown in FIG. 6(f), the winding portion of the barrier spring A55 is fitted concentrically with the pivot shaft of the barrier drive lever B57 and the barrier driving connection plate 54, and as shown in FIG. 6(e). Barrier drive connecting plate 54 is charged at both ends 55a and 55b as shown by the arrow inside.
protrusion 54b and protrusion 57 of the barrier drive lever B57.
Find a and a.

When the release switch 5 is turned on, the motor 7 starts reverse rotation (step S301), and the barrier drive gear 51 is rotated in the opposite direction (step S302).The barrier drive gear 51, barrier drive lever A53, and barrier drive connection plate 54
A crank mechanism between the two rotates the barrier drive connecting plate 54 in the opposite direction. When the barrier spring A55 is moved, a protrusion 57a. 54b is held, the barrier drive lever I357 also rotates in the same way as the barrier drive connection temporary 54, so the lens barrier 58 moves while being regulated by the barrier guide 59, and from FIG. 6(a) to FIG. 6( The barrier is in the open state as shown in b), and the barrier state detection means 52 outputs a barrier open signal or the camera microcomputer 6.
The motor 7 is stopped by the output (step S3).
04). Furthermore, charge accumulation in the image sensor 25 is started by outputting this barrier open signal to the camera microcomputer 6 (step S305).

The time from the start to the end of charge accumulation is determined by the result of photometry by the photometer 80, and the image sensor 25 is controlled by the camera microcomputer 6.

When the charge accumulation of the image sensor 25 is completed, the motor 7 starts to rotate in reverse direction again by the camera microcomputer 6 (step 3).
0 B), the barrier drive gear Sl also rotates in the opposite direction again. Here again, the barrier drive connection plate 54 is rotated in the forward direction by the crank mechanism between the barrier drive gear 51, the barrier drive lever A53, and the barrier drive connection plate 54. Then, the barrier drive lever B is activated by the barrier spring A55.
Since the lens barrier 57 also rotates in the same manner as the barrier drive connecting plate 54, the lens barrier 58 moves in the closing direction while being regulated by the barrier guide 59, and the barrier is closed as shown in FIG. 6(b) to FIG. 6(a). As a result, the barrier state detection means 52 outputs a barrier close signal (step S307), and the camera microcomputer 6 stops the motor 7 (step S307).
308).

When a force is applied from outside to open the lens barrier 58 while the lens barrier is closed, such as when a photographer tries to forcefully open the lens by hand, the operation is as shown in FIG. 6(c). There are two cases: a case where the barrier drive gear 51 and the planetary gear 10 are engaged, and a case where the barrier drive gear 5l and the planetary gear 10 are not engaged as shown in FIG. 6(d).

First, as shown in FIG. 6(c), when the barrier drive gear 51 is engaged with the planetary gear 10, the gear connection is connected to the motor 7, so the barrier drive gear 5I does not rotate. The barrier drive lever A53 and the barrier drive connection plate 54 also remain fixed. lens barrier 5
8 is opened by an external force, the position of the barrier drive lever B57 changes due to the movement of the lens barrier 58. As a result, the barrier drive connecting plate 54 and the barrier drive lever B5
Barrier spring A55 because the relative relationship of 7 changes.
The two are spring-coupled to prevent breakage.

In this state, the barrier spring A55 is in a state where its ends are engaged with the pivot pin 54d and the protrusion 57a, respectively. Therefore, when the external force is removed, the lens drive lever 857 is returned to the closed position by the biasing forces of the barrier spring A55 and barrier spring B56, and the lens barrier 58 is also returned to the closed state.

On the other hand, when the barrier drive gear 51 and the planetary gear l2 are not engaged, as shown in FIG. The positions of the drive connection plate 54, barrier drive lever 33, and barrier drive gear 51 also change. Since the barrier spring 856 is charged by this external force, when the external force disappears, the lens drive lever B57 is returned to the closed position by the biasing force of the barrier spring B56, and thereby the lens barrier 58 is also closed, and the barrier The drive connection plate 54, barrier drive lever A53, and barrier drive gear 5l are also returned to the closed state.

The above operation is performed when the photographer turns on the release switch 5 with a wide-angle lens, but when the photographer turns on the release switch 5 with a telephoto lens, the operation is as follows. That is, when the release switch 5 is turned on (step S301), the camera microcomputer 6 reverses the motor 7 (step S302), opens the lens barrier 58 (step S303), and after the end of exposure, the camera microcomputer 6 reverses the motor 7 again. let me lens burr 7
The operation up to closing 58 is exactly the same as when the release switch 5 is turned on in the wide-angle lens state (steps S304 to S308). When the barrier state detection means 52 inputs the barrier t close signal to the camera microcomputer 6, the lens state detection means 52
Since the signal is a telephoto signal (step S309), the camera microcomputer 6 causes the motor 7 to start rotating in the normal direction (
Step S311). The operations from this point on are similar to those in the case where the photographer stops operating the telephoto switch while the telephoto lens is in the above-mentioned state, and the photographing lens is returned to the wide-angle lens state.

Furthermore, when the photographer turns on the release switch 5 with the close-up lens on, the camera microcomputer 6 reverses the motor 7 (step S302) and closes the lens barrier 58 by turning on the release switch 5 (step S301). the camera microcomputer 6 reverses the motor 7 again after the exposure is completed (step S303).
304 to 8306) and closing the lens barrier 58 (steps S307 and 8308) are exactly the same as when the release switch 5 is turned on with the wide-angle lens being deaf. At the time when the barrier close signal is input to the camera microcomputer 6 by the barrier state detection means 52, the signal from the lens state detection means 52 is a close-up signal (steps S309, S310), so the camera microcomputer 6 starts normal rotation (step 9311). The operations from this point on are similar to those performed when the photographer cancels the operation of the close-up switch while in the close-up lens state described above, and the photographing lens returns to the wide-angle lens state.

The operation of the lens barrier and the photographic lens during photographing has been explained above, but at the time when the barrier close signal is output from the barrier state detecting means 52, the lens state detecting means 12 sends signals other than the wide-angle signal (telephoto signal, close-up signal, If the signal (switching signal) is output (steps S309, S31
0), the motor 7 is rotated forward by the camera microcomputer 6 (step S311), and the photographing lens is rotated by the lens-shaped deafness detection means 1.
2 until the wide-angle signal is output (steps 8312 to S314).

Above, in the mechanism for performing each operation, the lens switching operation by the meshing of the partially toothed gears 1101 and 11102 as shown in FIG. 7(a) has been described.
If 01 and 102 have a tooth shape like that shown in Figure 7(a), the first tooth to collide with the other gear will be subject to an impact force, so it will need to be strong. It's coming.

Therefore, as shown in Fig. 7(b), each gear tot, to2
It is safer to fill it with meat.

That is, a padding groove 101a as shown by the diagonal line is formed between the first tooth totb of the first tooth 10lb of the drive side gear 1101 and the second tooth 101c.

On the other hand, the overlay 101 of the driven gear ■102
A notch +02d corresponding to the built-up portion 101a is formed at a portion corresponding to a, that is, at the tip of the second tooth 102c of the driven gear I1102. Therefore, when both gears 101 and 102 mesh, the above-mentioned notch 102
d and the filler plate 101a are opposed to each other, so no load is applied to the engagement, and the drive side gear 110
1, the first tooth totb is the second tooth 1 of the driven gear [102]
It can be easily engaged with 02c. In addition, on the side opposite to the second tooth 102c of the first tooth 102b of the driven gear 11102 in FIG. Serving portion 102
It is also possible to form a.

This portion does not mesh with the first tooth 101b of the drive side gear 1101. In this way, Nikumori IQIa,I
By forming O2a in each gear lot, 102,
The driving gear 1101 to which impact force is applied and the driven gear I [
It becomes possible to provide sufficient strength to each of the 102 161110lb and 102b.

Next, a viewfinder switching operation that is performed simultaneously with the lens switching operation described above will be explained. The finder optical system is standard deaf when the photographic lens is a telephoto lens, and when the photographic optical system is a wide-angle lens, the wide-angle lens sub-optical system block 4l is located on the subject side of the finder main optical system. Furthermore, when the photographic optical system is used for close-up, a wedge lens block 45 is inserted on the subject side of the finder main optical system to reduce variation. The operation will be explained below.

FIGS. 8(a) to 8(f) are diagrams showing the viewfinder switching operation in three states of the photographic lens, and FIG.
a) and (b) are the ° state of the wide-angle lens, Fig. 8 (c)
, (d) shows the state of the telephoto lens, and Fig. 8 (e), (D shows the deaf state of the close-up lens. For simplicity, Fig. 8 (a), (c), ( 8(e) shows the operation of the front lens block 1 and the wide-angle lens sub-optical system block 41, and FIGS. 8(g) to 8(i) show a mechanism for performing the above-mentioned switching operation.
1a is a cylinder 45 of a wedge lens block 45 on the same axis.
a, wide-angle conga 42, cylindrical 42b, and kusabiga 4
No. 6 cylindrical portion 46a is pivotally attached. The wide-angle con spring 43 and the wedge spring 47 are arranged between the wide-angle con sub-optical system block 41 and the wedge lens block 45. The wide-angle conspring 43 is
As shown in FIG. 8(h), the winding part is fitted into the cylindrical part 41a of the wide-angle lens sub-optical system block 4l, and both ends 43a and 43b are jerked in the direction of the arrow, and the wide-angle lens is inserted between them. The protrusion 4lb of the condenser sub-optical system block 4l and the protrusion 42a of the wide-angle conga 42 are sandwiched in between. Further, as shown in FIG. 8(i), the wedge spring 47 has its winding portion fitted into the cylindrical portion 45a of the wedge lens block 45, and both ends 47a and 47b are directed in the direction of the arrow. After being charged, the protrusion 45b of the wedge lens block 45 and the protrusion 46a of the wedge gear 46 are
It is sandwiched between.

First, the operation of the wide-angle lens sub-optical system block 4l will be explained. When the front lens block l is in the position shown in FIG. 8(a), the gear 1e of the front lens block 1 and the wide-angle congear 42 are engaged, and the wide-angle con sub optical system block 4l and the wide-angle conga 42 are engaged. Since the wide-angle con spring 43 is connected by a spring, the con sub-optical system 4l is pressed and fixed to the wide-angle con stopper AC44B> when the wide-angle con spring 43 is charged.

When the front lens block 1 rotates in this state, the gear part 1e of the front lens block 1 and the wide-angle gear 42 are initially engaged, so the wide-angle gear 42 rotates, but the gear part 1e of the front lens block 1 When the teeth finish meshing, the last gear of the wide-angle gear 42 maintains its rotated position without moving backwards by sliding along the cam part 1r of the front lens block 1, and as shown in FIG.
) or (e), one end of the wide-angle con gear 42 is pressed by the pressing claw 1h of the front lens block l, thereby charging the wide-angle con spring 43, and the wide-angle con spring 43 is charged. The optical system block 4l is suppressed and fixed to the wide-angle con stopper B (44b), and is retracted out of the finder optical path (optical path center Y).

Next, the operation of the wedge lens block 45 will be explained. When the rear lens block 2 is in the position shown in FIGS. 8(b) and (d), the same conditions as in the above-mentioned wide-angle lens sub-optical system block 4I as shown in FIGS. 8(c) and 8(e) are taken. By pressing one end of the wedge gear 46 with the pressing claw 2h of the rear lens block 2 by the mechanism, the wedge spring 47 is charged, and the wedge lens block 4 is pressed.
5 is press-fixed to the wedge stopper B (48b) and retracted out of the finder optical path. Then, when the rear lens block 2 rotates, the first tooth of the wedge gear 46 is
It slides along the cam gear 2r of the rear lens block 2, and meshing starts from the first tooth of the gear 2e of the rear lens block 2, and the last tooth of the wedge gear 46 slides along the cam gear 2r of the rear lens block 2.
While engaged with the gear 2e, the wedge lens block 45 is pressed against the wedge stopper A (48a) by the charge of the wedge spring 47, and inserted into the finder optical path for positioning.

In this example, a wedge lens is used to correct balax in the wedge-up lens state.
A similar effect can be obtained by inserting another field frame into the finder optical path instead of the wedge lens.

With only the lens switching mechanism as explained above, the lens switching gear All and the lens switching gear B1 are
Since there is no gear connection between the lens block 1 and the rear lens block 2, the lens moe block l and lens rear block 2 maintain their positions only by the pressing force of the snap springs A16 and B17, respectively, and the camera is not subjected to impact loads, etc. It is conceivable that if this happens, it will switch to another state.

Therefore, in this embodiment, in order to prevent switching of the photographic lens due to external force, the switching prevention claw A18 shown in FIG.
and a switching prevention claw I320. The operation of this switching prevention pawl AI8 will be described below as an example.

The switching prevention pawl A18 is rotatably supported on the rotating shaft A (18a) as shown in FIG.
) and (b), the lens protrusion block 1 and the lens rear block 2 are maintained in a retracted position where they cannot be prevented from rotating. Note that the rear lens block 2 is not shown for simplicity.

When at least one of the front lens block 1 and the rear lens block 2 is at the O degree position, that is, when it is a wide-angle lens or a telephoto lens, it is possible to rotate the front lens block 1 and the rear lens block 2 in the forward direction. Inertial force due to external force is the above block! , 2, as shown in FIG. 9(a), when the straight line Z1 connecting the center of gravity of the switching prevention claw A18 and the rotation axis A (18a) is at the 1/+40" position of the lens front block. Since the weight balance is adjusted so that the straight line Zt connecting the center of gravity 1g and the lens rotation axis 22 is approximately parallel, an inertial force that causes the switching prevention claw Al8 to rotate in the forward direction also acts. The amount of pressing force of the switching prevention claw Al8 by the prevention spring A19,
The amount of pressing force on the front lens block 1 by the snap spring A16 and the amount of pressing force on the rear lens block 2 by the snap spring Bl7 are set approximately equal to the weight ratio of the switching prevention claw A18, the front lens block 1, and the rear lens block 2. Therefore, when the front lens block 1 and the rear lens block 2 are subjected to an inertial force that causes them to start rotating, the switching prevention claw AI8 also rotates, and the switching prevention claw Al8 changes the rotation locus of the front lens block 1 and the rear lens block 2. The claws 1 i, which are inserted into the lens blocks 12 and provided on both lens blocks 12,
2 i (see Fig. 8(b)), the rotation of both lens blocks 1.2 is prevented (see Fig. 9(b)).
c).

This inertial force is instantaneous, and when this inertial force disappears, the switching prevention claw A18, the lens front block 1, and the lens rear block 2 are activated by the switching prevention spring A19, the snap spring A16, and the snap spring Bl7.
is returned to its normal position (see FIG. 9(a)).

The switching prevention claw B20 shown in FIG. 9(e) also has the front lens block 11, rear lens block 2, center of gravity, axis of rotation, and spring force set in the same way as the switching prevention claw A18. , operates in the same way as the switching prevention pawl Al8 (FIGS. 9(b) and 9(d)). In addition, in the figure, Z is a straight line connecting the center of gravity of the switching prevention claw B20 and the rotating shaft 20a,
1 j. 2j (see Figure 8(b)) is the switching prevention claw B
20 is the claw part to be caught.

Furthermore, in this embodiment, an inertial force is applied due to an external force during the lens switching operation, and the switching prevention claw AI8 and the switching prevention claw B2
0 is the block in front of the lens! If the rear lens block 2 is locked, the motor and gear train may be destroyed due to the motor 7 continuing to rotate, so a slider is provided at the reduction gear 8. This prevents the gear train from being destroyed.

Furthermore, in this embodiment, the photographing lens system is divided into a front lens block 11 and a rear lens block 2, each of which operates independently, so that there is a risk of stray light entering the photographing optical path.

For this reason, as shown in FIG. 10, the front lens block 1 and the rear lens block 2 are provided with stray light prevention walls projecting in an arc shape to block stray light. That is, the surface H. of the front lens block l facing the rear lens block 2.
(See FIG. 4(a)), an annular first stray light prevention wall 1k surrounding the main optical system 1a is formed to protrude along the front-rear direction, and a lens rear block 2 is formed from the first stray light prevention wall 1k. Two second stray light prevention walls 112, lm extending in an arc shape around the rotation axis are formed to protrude along the front-rear direction.

In addition, a third annular stray light prevention wall 2k surrounding the sub optical system 2c is protruded along the front-rear direction on the surface ■] of the rear lens block 2 facing the front lens block l (see FIG. 4(a)). At the same time, a fourth stray light preventing wall 2Q extending from the third stray light preventing wall 2k and always closing the space between the two second stray light preventing walls ILlm is formed to protrude along the target direction. By installing such a stray light prevention wall,
Even when the sub optical system 2c is retracted from the image pickup side of the main optical system 1a etc. due to the rotation of the rear lens block 2, the fourth stray light prevention wall 2g is connected to the second stray light prevention wall 112,I.
Since the space between n and n is closed, it is possible to effectively prevent stray light from entering the camera. Therefore, a wide-angle lens (
Stray light can be prevented in each state of the lens (FIG. 10(a)), telephoto lens (FIG. 10(b)), and close-up lens (FIG. 10(C)), and during switching.

According to the above embodiment, the lens switching gear C14.0'l5 as the driven rotating member is directly connected to the lens switching gear All as the driving rotating member connected to the motor 7, and the other By indirectly connecting via the lens switching gear B13 as a driven side rotating member, the lens switching gears Cl4, C''l5 are rotated in the forward and reverse directions by the rotation of the motor 7 in one direction. Therefore, it is no longer necessary to rotate the motor 7 in forward and reverse directions, and the four switching means conventionally required to rotate the motor in forward and reverse directions and the camera for operating these switching means are no longer required. The two output ports of the microcomputer are also not required, and the control circuit for the motor 7 is not complicated and becomes inexpensive.In other words, the variable magnification mechanism of the camera according to the above embodiment uses the partially toothed gears 11, 13, and 14. A minimum of three gears are required, which increases the number of gears by at least two compared to the conventional mechanism shown in FIG. One thousand switching stages S are required between the motors 7, and only one output port of the camera microcomputer 6 for operating the switching means S is required.

Therefore, even if the number of gears increases by two, the mechanism as a whole can achieve reciprocating rotation interlocking at a much lower cost than the conventional side machine.

Further, according to the above embodiment, the lens switching gear Cl4
, C'l5, lenses la, 1b, 2
Since it is only necessary to move lens c into and out of the photographing optical path, the members that support lenses la, lb, and 2c, such as the lens barrel, can be
There is no need for zero rotation, and the camera can be made more compact.

In addition, the rotation of the motor 7 in the opposite direction, which is unnecessary for lens switching, can be used as a drive actuator for another mechanism, that is, a barrier opening/closing drive mechanism, as described as a modification in the above embodiment. Needless to say, in some cases, one drive actuator can serve as drive sources for different mechanisms, and the drive actuator 1
The structure becomes simpler for each individual unit, and a camera with many moving parts can be manufactured at low cost.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(e) are plan views of an electronic still camera equipped with a variable magnification mechanism according to an embodiment of the present invention, respectively;
Front view, bottom view, left side view, right side view, Figure 1(f)
2 is an explanatory diagram showing the drive system provided in the still camera, and FIGS. 2A to 2C are explanatory diagrams showing the states of the wide-angle lens, telephoto lens, and close-up lens, respectively.
Figure 3 is a diagram showing the photographing distance with each lens and the screen ratio when photographing a person, Figure 4 (a) is a sectional view of the main part showing the lens switching drive mechanism, Figure 4 (b), ( d).
(D, (h). (D. (1) is an explanatory diagram showing the operation of the front lens block, respectively, and FIG. 4 (c).
(e), (g), (i). (k) , (
s) is an explanatory diagram showing the operation of the rear lens block, and the fifth
FIG. 5(a) is a pattern diagram of the patterned substrate of the lens condition detection means, FIG. 5(b) is a timing chart diagram showing signals generated by the patterned substrate and the section, and FIGS. 6(a) to 6(a).
(d) is an explanatory diagram showing the barrier opening/closing operation, and FIG. 6(e)
) to (g) are explanatory diagrams of the barrier opening/closing mechanism, respectively, and FIG.
) and (b) are respectively a front view of a partially toothed gear and a front view when a built-up part is formed on the gear, and FIGS. 8(a) and (
b) is an explanatory diagram of the finder switching operation in a wide-angle lens, and Fig. 8(c). (d) is an explanatory diagram of finder switching operation in a telephoto lens, Fig. 8(e),
(1') is an explanatory diagram of the finder switching operation in the close-up lens, FIGS. 8(g) to (i) are explanatory diagrams of the mechanism that performs the finder switching operation, and FIG. 9(a)
-(d) are explanatory diagrams showing the operation of the switching prevention mechanism, respectively, and No. 9
Figure (e) is a perspective view showing the installation state of the switching prevention spring, Figures 1θ (a) to (C) are explanatory diagrams showing the sides of the stray light interrupter, and Figures 11 (a) and (b) are the lenses. 11(e) is a flowchart of the barrier opening/closing operation, FIG. 12 is a circuit diagram of the zoom mechanism of the camera according to the above embodiment, and FIGS. 13 and 14 respectively show the conventional switching mechanism. FIG. 2 is a circuit diagram and an explanatory diagram. ! ... Lens front block, la, lb... Main optical system, 1k, 1 (2, Im... Stray light prevention wall, 2... Lens rear block, 2c... Sub optical system, 2k, 2e ...
Stray light prevention wall, 3... Telephoto switch, 4... Close-up switch, 5... Release switch, 6...
Camera microcomputer, 7...Motor, 8...Reduction gear,
9... Sun gear, IO... Planetary gear, 2... Lens switching gear A, 12... Lens-shaped deafness detection means, 13.
... Lens switching gear B1 14... Lens switching gear C
1! 5...Lens switching gear C゜, 16...Snap spring A1 17...Snap spring B%
l8...Switching prevention claw A, 19...Switching prevention spring A120...Switching prevention claw B, 21...Switching prevention spring B122...Lens rotation axis, 23...Lens positioning A124... Lens positioning B125・
...Image sensor, 40...Finder row, 4l...
Wide-angle conga sub optical system block, 42... wide-angle conga,
43... Wide angle con spring, 44... Wide angle con stopper, 45... Wedge lens block, 46...
・Kusabi Gya, 47...Kusabi Spring, 48...
・Wedge stopper, 51...Barrier drive gear, 52
...Barrier-like deafness detection means, 53...Barrier drive lever, 54...Barrier drive connection plate, 55...Barrier spring A156...Barrier spring B157...
・Barrier drive lever B158...Lens barrier, 59
...Barrier guide, 70...Flash, 7l...
・DC power supply, 80 photometry section, 90...main switch,
+01...Drive side gear ■, 1 0 1a, I O
2a - built-up part, 101b102b...first tooth, 101c, l02c - second tooth, 102...
・Driven side gear ■, IO2d... Notchro. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Aoyama Aoyama and 2 others Ward (0) Figure (b) Figure 1 (fl Figure (C) Figure 1 (d) Figure (e) Figure 21! I(Cl Figure 4tb+ Figure 4(Cl Figure 4(fl +45 Figure 4(9} Figure 4(dl ■ Figure 4(el Figure 4(hl Figure 4C Figure 4(j3 Figure 4 (kl Figure 4 (jl Figure 4 fm) Figure 6 (a) Figure 6 (C) Figure 6 (d) Figure 6 (b) l 102b Figure 8 (0) Figure 8 ( b) Fu Figure 8 (C) Figure 8 (d) Figure 8 (9) Figure 9 (e) J9, 21 Figure 12 Figure 13 Figure 14 r

Claims (5)

[Claims] (1) Drive-side rotating member (11) connected to the motor (7)
), a first driven rotating member (13), and a second driven rotating member (14, 15), the driving side rotating member (11) and the first driven rotating member (13). Transmission of the driving force between the driving side rotating member (11) and the second driven rotating member (11) is possible only in the first section of the rotation angle of the driving side rotating member (11). 14, 15) is possible only in a second section of the rotation angle of the drive-side rotating member (11) that does not overlap with the first section, and The side rotating member (13) and the second driven side rotating member (14)
. (2) A driving side rotating member (11), a first driven side rotating member (13), and a second driven side rotating member (14, 15), the driving side rotating member (11) and the first driven side rotating member (14, 15). The driving force is constantly transmitted between the driven rotating member (13) and the driving rotating member (11) and the second driven rotating member (13).
14, 15) is possible only in a predetermined section of the rotation angle of the driving side rotating member (11), and the driving force can be transmitted between the first driven rotating member (13) and the first driven rotating member (13). The driving force can be transmitted between the two driven rotating members (14, 15) only in other sections that do not overlap with the predetermined section of the driving rotating member. Camera magnification mechanism. (3) The first driven rotating member (13) and the second rotating member
Each stopper (23, 24) regulates a predetermined rotational position of each of the driven side rotating members (14, 15), and each of the driven side rotating members (13, 14, 15)
23, 24).
Each snap spring (1
6, 17). The variable magnification mechanism for a camera according to claim 1. (4) A stopper (23) that regulates a predetermined rotational position of the second driven rotating member (14, 15), and a stopper (23) that regulates a predetermined rotational position of the second driven rotating member (14, 15);
) so as to engage with the second driven rotating member (14, 1
3. The camera zooming mechanism according to claim 2, further comprising a snap spring (16) for biasing the camera. (5) The lens magnification mechanism for a camera according to claim 3, wherein the predetermined lens is positioned at the photographing position or the retracted position with respect to the photographing optical path at the predetermined rotational position.