JPH0736096A - Collapsible barrel type zoom camera - Google Patents

Abstract

PURPOSE:To miniaturize a mechanism part by eliminating an idle area where a photographing auxiliary means moves at the time of barrel collapse operation. CONSTITUTION:A photographing optical system moving in a variable power moving area and a barrel collapse moving area between Tele-Wide is internally provided in a lens barrel 1 and the lens barrel 1 possesses cam barrels 23 and 24. A gear 30 transmitting the driving force of a motor 52 is meshed with a rack 23d and only the cam barrel 23 is rotated at the time of variable power operation. By the rotation, a cam part 69 is rotated from the rack 23 through the gears 57 and 58 and finder lenses 61 and 62 engaged with the cam part 69 and a light emitting part 63 are moved. At the time of the barrel collapse operation, the gear 30 is meshed with the rack 24d and only the cam barrel 24 is rotated, so that the driving force is not transmitted to the cam part 69.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom camera having a zoom function, and more particularly to a collapsible zoom camera in which a lens barrel is pulled out for use during shooting and the lens barrel is shortened when not in use. .

[0002]

2. Description of the Related Art In a conventional camera of this type, it is known that a zooming operation and a collapsing operation of a photographing optical system are continuously performed using a cam barrel or the like. In addition, the viewfinder lens and the light emitting section (strobe), which are shooting assisting means, need to change the viewfinder magnification and the irradiation angle of the light emitting section according to the magnification of the shooting optical system. The rotation is transmitted to the photographing assisting means by a reduction gear or the like.

FIG. 7 is a perspective view showing the structure of an example of a conventional retractable zoom camera. As shown in FIG. 7, the camera 50 is provided with a motor 52 as a drive unit and gears 53, 54, 55 as a power transmission unit, and the gear 55 is provided on the outer cylinder 51 a of the lens barrel 51. It engages with a rack portion 56 formed on the outer peripheral portion along the circumferential direction thereof.

When the motor 52 is rotated, the lens barrel 5
When the outer cylinder 51a of No. 1 is rotated, the photographing optical system (not shown) provided inside the lens barrel 51 is rotated by the rotation of the outer cylinder 51a, and the zooming region (between the Wide position and the Tele position) is set.
To move in the direction of the optical axis to perform a magnification change operation. In addition, this photographing optical system has a retractable area (between the retracted position and the Wide position).
To move in the direction of the optical axis to perform a collapsing operation.

Further, the camera 50 is provided with gears 57 and 58 which mesh with the rack portion 56.
It meshes with a gear portion 59d formed on the cam portion 59. The cam portion 59 has a plurality of cam grooves 59a, 59b, 5
9c are formed, and these cam grooves 59a, 59 are formed.
b and 59c respectively include a finder variable magnification lens unit 6
The respective support shafts 61a and 62a of 1, 62 and the support shaft 63a of the light emitting portion 63 are engaged with each other.

The cam grooves 59a, 59b and 59c are groove portions 59a-1, 59b-1 and 59c-1 on which the support shafts 61a, 62a and 63a slide during the zooming operation, and a groove portion 59a which slides upon the collapsing operation. -2, 59b-2, 59c-
2 and.

When the rotation of the lens barrel 51 is transmitted to the cam portion 59 by the rotation of the gears 57 and 58, the cam portion 59 is rotated.
Rotates about the support portion 60 as a fulcrum. By this rotation, the support shaft 61 of the finder variable magnification lens units 61 and 62 is
When the a and 62a move along the cam grooves 59a and 59b, the finder variable magnification lens parts 61 and 62 move in the extending direction of the guide shaft 64, and the finder fixed lens 6 is moved.
6, 68 and the finder frame 67 are moved toward and away from each other. Further, the support shaft 63a of the light emitting portion 63 moves along the cam groove 59c, so that the light emitting portion 63 moves along the extending direction of the guide shaft 65.

[0008]

However, in the above-described conventional retractable zoom camera, since the rotation of the lens barrel 51 and the rotation of the cam portion 59 are interlocked with each other, the viewfinder variable magnification lens portions 61, 62 and The light emitting unit 63 is not limited to the zooming operation of the lens barrel 51, but also operates in the collapsing operation. Therefore, it is necessary to form play areas, that is, groove portions 59a-2, 59b-2, 59c-2, in the cam grooves 59a, 59b, 59c so as to correspond to the collapsing operation of the lens barrel 51. Therefore, the cam portion 59 must be made large in order to form this region, which causes a problem that the device becomes large.

The present invention has been made in order to solve the above-mentioned problems, and eliminates a play area in which the photographing assisting means moves in response to the collapsing operation of the photographing optical system, thereby reducing the size of the apparatus. The purpose is to

[0010]

In order to achieve the above-mentioned object, a solution for a retractable zoom camera according to the present invention comprises:
A photographic optical system (11, 12, 13) that moves in the variable power movement area and the retractable movement area, and a photographic assisting means (61, 62, 63) that varies according to the amount of movement of the photographic optical system are provided. Driving means (52) in a collapsible zoom camera
And a first moving means (1) for moving the photographing optical system.
5, 17, 19, 23, 24) and second moving means (57, 58, 64, 6) for moving the photographing assisting means.
5, 69) and the driving force from the driving means are transmitted to the first and second moving means in the variable power moving area, and are transmitted to the first moving means in the retractable moving area. Driving force transmission means (23d, 24d, 23
g, 24g, 30, 31, 32, etc.).

[0011]

In the above-mentioned solution means, the driving force only when the photographing optical system moves in the variable magnification moving area is transmitted to the photographing assisting means, and the driving force when the photographing optical system moves in the retractable moving area is the photographing assisting means. Not transmitted to the means. Therefore, it is not necessary to form a region corresponding to the collapsing operation of the photographing optical system in the second moving unit, and the second moving unit can be downsized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a retractable zoom camera according to the present invention will be described below with reference to the drawings. 1 and 2 are sectional views showing the configuration of an embodiment of a lens barrel of a collapsible zoom camera according to the present invention. FIG.
FIG. 2 shows the Wide state. In FIG. 1, the taking optical system 10 of the lens barrel 1 includes a first lens group 11 and
It is composed of a second lens group 12 including front and rear lens groups 12a and 12b, and a third lens group 13. The first lens group 11 is fixed to the tube 15. The front lens group 12a of the second lens group 12 is fixed to the shutter block 16. The shutter block 16 is fixed to the vibration isolation unit 17 with screws 21.

The rear lens group 12b of the second lens group 12
Are fixed in the lens chamber 14. The lens chamber 14
It is supported by a mechanism unit (not shown) so as to be movable in a direction substantially perpendicular to the optical axis 20 direction with respect to the image stabilizing unit 17.
The third lens group 13 is fixed to the helicoid ring 18. The helicoid ring 18 has a male helicoid part 1
8b is formed and is in helicoidal connection with the female helicoid portion 19b formed in the focus unit 19. The focus unit 19 has a mechanism part (not shown) inside thereof, and operates the helicoid ring 18.

The fixed cylinder 22 is fixed to the main body 25. The zoom cam barrel 23 and the collapsible cam barrel 24 are rotatably attached to the outer peripheral portion of the fixed barrel 22, and are further pressed by a ring 26 so as not to move in the optical axis direction. Further, the light-shielding cylinder 27 is arranged between the cylinder 15 and the fixed cylinder 22 and is fixed to the vibration isolation unit 17. The front ring 18 is fixed to the cylinder 15.

The cylinder 15, the vibration isolation unit 17, and the focus unit 19 are respectively provided with three follower pins 15a, 17a, 19a protruding outward. The follower pins 15a, 17a, 19a are formed with cylindrical portions 15a-1, 17a-1, 19a-1 and tapered portions 15a-2, 17a-2, 19a-2, respectively.

Each follower pin 15a, 17a, 19a
The cylindrical portions 15a-1, 17a-1, 19a-1 are slidably fitted in the straight-moving grooves 22a (nine places) formed in the fixed barrel 22, so that the barrel 15, the vibration isolation unit 1
7. The focus unit 19 is movable only in the optical axis 20 direction. In addition, each follower pin 15a, 17
a, 19a tapered portions 15a-2, 17a-2, 19
The a-2 is held in cam grooves 23a and 24a (nine places each) formed in the zoom cam barrel 23 and the retractable cam barrel 24, respectively.

Therefore, the barrel 15, the vibration isolation unit 17, and the focus unit 19 are supported by the zoom cam barrel 23, the collapsible cam barrel 24, and the fixed barrel 22 so as to be movable in the optical axis direction.

Next, the zoom cam barrel 23 and the retractable cam barrel 2
A more detailed configuration of No. 4 will be described. 3 to 5 are development views of the lens barrel 1 as viewed from the outside (including a see-through portion in part). FIG. 3 is a collapsed state, and FIG. 4 is a collapsed state of FIG.
FIG. 5 shows the state in the middle of reaching the de state, and the wide state. 3, cam grooves 23a (23a-1, 23a-2, 23a-3) formed in the zoom cam barrel 23
Is formed on the inner peripheral side of the zoom cam barrel 23 as an inner cam in the area Z1 and penetrates in the area Z2. The cam grooves 23a have 3
Cam grooves 23a-1, 23a-2, 23 formed one by one
It is composed of a-3. FIG. 3 shows only one cam groove 23a-1, 23a-2, and 23a-3, respectively. The other cam grooves 23a are formed on the circumference at equal intervals. Cam grooves 23a-1, 23a-2, 23
The follower pins 15a of the cylinder 15, the follower pins 17a of the image stabilizing unit 17, and the follower pins 19a of the focus unit 19 are engaged with each other at a-3.

In the area Z2, the cam groove 23a-3 partially has a parallel portion A. Further, the end portion of the cam groove 23a-2 has a sliding surface B on which the lift piece 29 held by the end portion of the cam groove 23a-2 can slide in the optical axis 20 direction (vertical direction in the drawing). The lift piece 29 is a follower pin 29.
The follower pin 29a is engaged with a lift groove 24b formed on the inner peripheral side of the retractable cam barrel 24 (see FIG. 1).

The collapsible cam cylinder 24 has a collapsible groove 24c-1,
A collapsible groove 24c composed of 24c-2 and 24c-3 is formed. These collapsible grooves 24c-1, 24c-2, 2
4c-3 are follower pins 15a, 15a of the cylinder 15, respectively.
The follower pin 17a of the image stabilizing unit 17 and the follower pin 19a of the focus unit 19 are engaged with each other.

A drive gear 30 which is rotated by a drive force from a drive unit (not shown) is provided outside the lens barrel 1. The drive gear 30 is supported by the main body 25 (FIG. 1) and can be engaged with rack portions 23d and 24d provided on the outer peripheral portions of the zoom cam barrel 23 and the collapsing cam barrel 24 so as to extend in the circumferential direction. It is located in.

The locking lever 31 is rotatably supported with a shaft 31c as a fulcrum, and has a locking portion 31a and an operating portion 31.
b. The locking portion 31a is provided on the zoom cam barrel 23.
The rotation of the zoom cam barrel 23 is stopped by engaging with the groove 23e formed in the. The operation portion 31b is brought into contact with the outer peripheral surface 24h of the retractable cam barrel 24 by the urging force of the spring 33 attached to the locking lever 31.

Here, as shown in FIG. 3, the retractable cam barrel 2
The outer peripheral surface 24h of No. 4 has a low surface portion 24h-1 and a high surface portion 24h.
-2, and a slope portion 24h-3 is formed at these transition portions. When the operation portion 31b is in contact with the lower surface portion 24h-1, the locking portion 31a
Is held at a position away from the zoom cam cylinder 23. Further, when the operating portion 31b is in contact with the high surface portion 24h-2, the locking portion 31a is in contact with the zoom cam barrel 23,
The groove 23e can be engaged.

Similarly to the above, the locking lever 32 is provided with the shaft 32.
The lock portion 32a is rotatably supported by c and engages with the groove 24e formed in the collapsible cam barrel 24, and the outer peripheral surface 23h (lower surface portion 2) of the zoom cam barrel 23 by the urging force of the spring 34.
3h-1, a high surface portion 23h-2, an inclined portion 23h-3) and an operation portion 32b that abuts.

The zoom cam barrel 23 is formed with a step portion 23g extending in the circumferential direction thereof.
A projecting portion 24g formed so that one end of the retractable cam barrel 24 projects is engaged with g. Therefore, the zoom cam barrel 23 and the collapsible cam barrel 24 have a stepped portion 23g.
The relative rotation is limited by the and the protrusion 24g.

Next, the operation of the lens barrel 1 will be described. In FIG. 3, the drive gear 30 is rotated from this collapsed state by a control unit (not shown). The drive gear 30 meshes only with the rack portion 24d of the retractable cam barrel 24 (not with the rack portion 23d of the zoom cam barrel 23).
Further, in this state, the operating portion 3 of the locking lever 31
1b is a high surface portion 24h-of the outer peripheral surface 24h of the retractable cam barrel 24.
2 and the locking portion 31a is in the groove 23 of the zoom cam barrel 23.
Since it is engaged with e, the zoom cam barrel 23 is non-rotatably locked.

When the drive gear 30 is rotated, the retractable cam barrel 24 rotates in the C direction in the figure. By this rotation, the follower pins 15a and 19a are respectively retracted into the collapsing groove 24c-.
1. The cam groove 23a-3 moves along the direction of 20a in the figure. Also, the follower pin 29a of the lift piece 29
Moves upward in the figure along the lift groove 24b. As a result, the lift piece 29 is pushed upward in the figure, and the lift piece 29 pushes the follower pin 17a upward in the figure.

When the retractable cam barrel 24 further rotates in the direction C in the figure, the contact position of the operating portion 31b of the locking lever 31 changes from the high surface portion 24h-2 of the retractable cam barrel 24 to the sloped portion 24h-.
3 and further to the lower surface portion 24h-1. As a result, the locking lever 31 is rotated clockwise in the drawing about the shaft 31c as a fulcrum by the urging force of the spring 33, and the locked state between the locking portion 31a and the groove 23e of the zoom cam barrel 23 is released.

Immediately after this, the protrusion 24 of the retractable cam barrel 24
g contacts one end 23g-1 of the step portion 23g, and the zoom cam barrel 23 starts to rotate integrally with the retractable cam barrel 24. With the above operation, the lens barrel 1 moves from the state of FIG.
It becomes the state of.

When the zoom cam barrel 23 rotates, the rack portion 23d of the zoom cam barrel 23 comes into mesh with the drive gear 30. Further, the follower pin 15a has a collapsible groove 24c-
The engagement with 1 shifts to the engagement with the cam groove 23a-1, and similarly, the follower pin 17a engages with the cam groove 23a-2.

When the zoom cam barrel 23 and the collapsible cam barrel 24 rotate further, the rack portion 24d of the collapsible cam barrel 24 disengages from the drive gear 30, and the rack portion 24d and the drive gear 30.
The engagement with is released. Immediately after this, the locking lever 3
The contact position of the second operation portion 32b is from the lower surface portion 23h-1 of the zoom cam barrel 23 to the inclined surface portion 23h-3, and further to the higher surface portion 2.
3h-2, the locking portion 32a is moved to the groove 2 of the collapsible cam barrel 24.
4e is engaged, and the rotation of the retractable cam barrel 24 is stopped. After that, only the zoom cam cylinder 23 rotates, and the rotation of the drive gear 30 is stopped by the control unit at the Wide position. With the above operation, the lens barrel 1 moves from the state of FIG.
It becomes the state of. Further, the state of FIG. 1 changes to the state of FIG. The area between the collapsed position and the Wide position is the collapsed area.

In FIG. 5, from this Wide position,
Only the zoom cam cylinder 23 rotates, and the follower pin 15a,
17a and 19a are cam grooves 23a-1 and 23a, respectively.
-2 in the figure up to the end portion (Tele position) of -2 and 23a-3
Move along the direction of 0a. This Wide position ~ Te
The area between the le positions is the zoom area.

The operation from the Tele position to the Wide position and the operation from the Wide position to the retracted position are the opposite operations to those described above. However, Wid
Between the e position and the retracted position, the follower pin 17a that is disengaged from the cam groove 23a-2 has
By being pushed down by 5, it is returned to the retracted position.

Next, the zooming operation of the viewfinder portion and the operation of changing the irradiation angle of the light emitting portion of the retractable zoom camera equipped with the lens barrel 1 will be described. FIG. 6 is a perspective view showing the configuration of an embodiment of the retractable zoom camera according to the present invention, showing the state at the Tele position.
6, the same parts as those in FIG. 7 are designated by the same reference numerals, and the duplicated description will be appropriately omitted.

6, the camera 40 is provided with a cam portion 69 corresponding to the cam portion 59 of FIG. The cam portion 69 includes cam portions 59a-1 and 59b shown in FIG. 7, respectively.
Cam grooves 69a, 69b, 6 corresponding to -1, 59c-1
9c is formed. That is, these cam grooves 69
Reference characters a, 69b, and 69c correspond only to the zooming operation of the lens barrel 1.

The gear 57 meshes with the rack portion 23d of the zoom cam barrel 23, and the rack portion 2 of the retractable cam barrel 24 is engaged.
It does not mesh with 4d. Therefore, by the gears 57 and 58 and the gear 69d of the cam portion 69, the zoom cam barrel 23
Only the rotation of is transmitted to the cam portion 69. As is apparent from the above description, the zoom cam barrel 23 rotates between the vicinity of the Wide position and the Tele position, and the retracted position and the Wide position.
It does not rotate between the vicinity of the e position.

As a result, the cam portion 69 is substantially W
It is rotated between the side position and the Tele position, that is, corresponding to only the zooming operation of the lens barrel 1. Therefore, the finder variable magnification lens units 61 and 62 and the light emitting unit 63 are movable only in the variable power region, and the finder variable power lens units 61 and 62 and the light emitting unit 63 are stopped in the retracted region. You can Therefore,
Only the taking optical system 10 can be retracted.

An embodiment of the retractable zoom camera according to the present invention has been described above. However, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the present invention. It is possible. For example, the finder variable magnification lens units 61 and 62 and the light emitting unit 63 have been given as examples of the photographing assisting means, but it is not always necessary to change all of them. When it is not necessary to change the light emitting unit 63 in response to the zooming operation of the lens barrel 1, the light emitting unit 63 may be fixed. The light emitting unit 63 in this case is
It is not a photographing assisting means that varies according to the amount of movement of the photographing optical system in the present invention.

[0039]

According to the collapsible zoom camera of the present invention, since the photographing assisting means is linked only to the magnification changing operation of the photographing optical system, the second moving means is used only for the magnification changing operation of the photographing optical system. The second moving means can be downsized, and the manufacturing cost of the mechanical component can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of a lens barrel of a retractable zoom camera according to the present invention.

FIG. 2 is a cross-sectional view showing a state when the photographing optical system is changed from the retracted state of FIG. 1 to the Wide state.

FIG. 3 is a development view of the lens barrel 1 in the collapsed state of FIG. 1 seen from the outside.

FIG. 4 is a development view showing a state on the way from the collapsed state to the Wide state of FIG.

FIG. 5 is a development view showing a state when the collapsed state of FIG. 3 is changed to the Wide state.

FIG. 6 is a perspective view showing a configuration of an embodiment of a retractable zoom camera according to the present invention.

FIG. 7 is a perspective view showing a configuration of an example of a conventional retractable zoom camera.

[Explanation of symbols]

 1 Lens barrel 10 Photographing optical system 11 First lens group 12 Second lens group 13 Third lens group 15 Tube 17 Anti-vibration unit 19 Focus unit 15a, 17a, 19a Follower pin 20 Optical axis 23 Zoom cam tube 23a Cam groove 23d rack part 23e groove 23g step part 24 collapsible cam barrel 24c collapsible groove 24d rack part 24e groove 24g projection part 30 drive gear 31, 32 locking lever 61, 62 viewfinder variable magnification lens part 63 light emitting part 69 cam part 69a, 69b, 69c cam groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sone Isao Marunouchi 3-chome 3-2, Chiyoda-ku, Tokyo Nikon (72) Inventor Junichi Omi 3-chome 2-3 Marunouchi, Chiyoda-ku, Tokyo Ceremony Company Nikon

Claims (1)

[Claims] 1. A collapsible zoom camera comprising: a photographing optical system that moves a zooming movement region and a collapsible movement region; and a photographing assisting unit that changes according to a movement amount of the photographing optical system. A first moving means for moving the photographing optical system, a second moving means for moving the photographing assisting means, a driving force from the driving means, and the first and the second moving means in the variable power moving area. The retractable zoom camera, further comprising: driving force transmitting means for transmitting to the second moving means and transmitting to the first moving means in the retractable moving area.