JPH08248496A - Multifunction bifocal camera - Google Patents

Abstract

(57) [Summary] In the present invention, a main lens system and a lens shutter are provided on the front surface of a mounting base that can be largely moved along the photographing optical axis, and further, in a narrow space between the lens shutter and the mounting base, An additional optical system, which has a function different from that of the sub-lens system for focal length conversion, is detachably installed, and the movement of the additional optical system in the thrust direction (optical axis direction) suppresses the thrust direction of the lens shutter. It is suppressed by the plate and the front surface of the mounting base so that the additional optical system is stably held at the insertion position on the photographing optical axis and the retracted position outside the photographing optical axis.
The holding frame that holds the additional optical system slides on the front surface of the mounting base, so that the holding frame can be smoothly displaced without lateral movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bifocal camera capable of switching the focal length of a photographing lens by inserting a sub-lens system on the optical axis of a main lens system capable of photographing independently, and particularly to the sub-lens Relates to a bifocal camera to which an optical system having different functions can be added.

[0002]

2. Description of the Related Art Conventionally, small cameras having many functions such as automatic exposure adjustment, automatic focus adjustment, and flash function, which have good portability and can be easily taken, have been widely used. In order to realize multiple functions based on diversity, a multifunction small camera such as a so-called bifocal camera, which can convert the focal length of a taking lens, has been developed and is already on the market. In these small cameras, in order to make the camera body compact and lightweight, a lens shutter that also serves as an aperture is generally used on the side of the taking lens, and a filter or close-up lens desired depending on the intention of taking a picture, the condition of the subject, and the like. Conventionally, when using such an optical system, those optical systems have been mounted on the front surface of the taking lens by a screwing type or a covering type.

[0003]

In the conventional method of mounting a filter or a close-up lens on the front surface of the taking lens by the screw-in type or the cover-type as described above, when the filter or the close-up lens is not used, They must be carried around in the photographer's clothes pocket or equipment storage bag, and they may be lost or misplaced. Therefore, it is conceivable to install a filter or a close-up lens on the front surface of the taking lens so that the filter and the close-up lens can be attached to and detached from the lens as in a known lens barrier. The photographic lens barrel to be wrapped becomes thick and further protrudes greatly from the camera body, making the camera itself inconvenient to carry. Furthermore, it is conceivable that the optical system having another function such as a filter or a close-up lens can be inserted / removed so as to be coaxial with the swing center of the sub lens for focal length conversion. Not only the mechanism becomes complicated, but also the support of the inserted optical system becomes unstable, which may adversely affect shooting.

The present invention solves the above-mentioned problems and has a very simple structure without affecting the insertion of the sub-lens accompanying the switching of the focal length, and yet another optical system can be smoothly and surely used for taking an optical axis. An object is to provide a bifocal camera that can be inserted and removed.

[0005]

In order to solve the above problems, in the present invention, in a bifocal camera having a lens shutter also serving as an aperture immediately after a main lens system, a main lens system and a lens shutter are provided in front of the bifocal camera. And a mounting base that supports the sub-lens system for focal length conversion on the back side so that it can be inserted into and removed from the shooting optical axis, and is movable along the shooting optical axis, and the mounting base and the lens shutter. An additional optical system that is removably provided on the photographing optical axis between and has a function different from that of the sub-lens system, and a sub-lens system moving unit that inserts and removes the sub-lens system according to the movement of the mounting base, The technical point is to have an additional optical system moving means for inserting and removing the additional optical system arbitrarily.

[0006]

[Operation] In the present invention, the main lens system (L ₁ ) is provided on the front surface of the mounting base (7) which can be largely moved along the photographing optical axis.
And a lens shutter (9) are provided, and a narrow space (S) between the lens shutter (9) and the mounting base (7) is provided separately from the sub-lens system (L ₂ ) for focal length conversion. The additional optical system (20) having the function of (6) is detachably provided, and the movement of the additional optical system (20) in the thrust direction (optical axis direction) suppresses the thrust direction of the lens shutter (9) by a partition plate (9A). ) And the front of the mounting base (7),
A holding frame (21) for stably holding the additional optical system (20) at the insertion position on the photographing optical axis and the retracted position outside the photographing optical axis, and for holding the additional optical system (20). By sliding on the front surface of the mounting base (7), the holding frame (21) can be smoothly displaced without lateral shake. Further, the insertion / removal of the additional optical system (20) is performed by the additional optical system moving means (23).
Is performed independently of the movement of the optical axis in the optical axis direction, and the additional optical system (20) is used not only when the taking lens is in the wide-angle state, but also when the taking lens is in the telephoto state and during the switching of the focal length. It becomes possible to insert and use.

Further, since the sub-lens system (L ₂ ) is provided on the back surface of the mounting base (7) so that it can be inserted and removed, the lateral blur in the thrust direction of the sub-lens system (L ₂ ) depends on the back surface of the mounting base (7). It is suppressed and is stably held at the insertion position and the retracted position. Furthermore, this secondary lens system (L ₂ )
According to the movement of the mounting base (7) in the shooting optical axis direction,
It is automatically inserted / removed by the auxiliary lens system moving means.

[0008]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a photographing lens barrel portion of a bifocal camera showing an embodiment of the present invention, showing a wide-angle state in which a sub lens system is retracted from the photographing optical axis, and FIG.
-II sectional view, FIG. 3 is a sectional view showing a telephoto state in which the sub-lens system is inserted on the photographing optical axis in the embodiment of FIG.
In FIG. 1, a gear 2A is provided on the outer circumference of a rotary lens barrel 2 rotatably provided in the front part of a camera body 1, and a pinion gear 4 driven by a drive source 3 such as a reversible motor.
Is meshing with. Further, a mounting base 7 is fixed by a machine screw 8 inside the rectilinear lens barrel 6 which is screwed into the rotary lens barrel 2 via the helicoid screw 5. On the front side (right side in FIG. 1) of this mounting base 7, a shutter 9 that also serves as an aperture is used.
A shutter control device 10 for driving the lens and a main lens system moving device 11 for moving the main lens system L ₁ in the optical axis direction to adjust the focus are fixed by a machine screw 12.
The main lens system L ₁ is held in the main lens frame 13, and the main lens frame 13 is screwed with the cylindrical portion 11A of the main lens system moving device 11 via the helicoid screw 14 to form the cylindrical portion 1
The main lens frame 13 is configured to advance and retreat in the optical axis direction by the rotation of 1A.

On the other hand, the sub lens system L₂Secondary lens to hold
The frame 15 has arms 15A and is planted on the mounting base 7.
Is rotatably supported around the pin axis 16 and is a secondary lens.
The frame becomes a solid line in FIG. 4 due to the biasing force of the tension coil spring 17.
Rotate counterclockwise as shown in Fig.
When contacting the protrusion 18 protruding from the surface, the sub lens system L ₂
The optical axis of is the main lens system L₁Configured to match the optical axis of
Have been. The main lens system L₁And sub lens system L₂And
Therefore, a photographing optical system is configured.

In FIG. 2, a guide plate 1 fixed to a fixed portion (not shown) of the camera body 1 and extending in the optical axis direction.
The reference numeral 9 penetrates a notch groove 7A provided in the mounting base 7 and projects long to the right. This guide plate 19 is shown in FIG.
As shown in FIG. 5, a cam surface 19A that engages with an engaging arm 15B provided on the sub lens frame 15 is provided on one of the protruding portions, which is formed in a forked shape. Both side surfaces 19a and 19b of the guide plate 19 are slidable on the inner surfaces of the two guide protrusions 7B and 7C that are formed to project from the back surface of the mounting base 7 in the vicinity of both ends of the cutout groove 7A. When the rotary lens barrel 2 is rotated, the mounting base 7 is linearly guided together with the linear lens barrel 6 in the optical axis direction. When the mounting base 7 is retracted leftward from the telephoto position shown in FIG. 3, the engaging arm 15B moves leftward along the cam surface 19A and rotates clockwise in FIG.
The sub-lens frame 15 is configured to be displaced to a retracted position indicated by a chain double-dashed line.

[0011] the filter frame 2 and the auxiliary lens system L ₂ holds the filter 20 as an optical system having different functions
1 is provided in a relatively narrow space S between the mounting base 7 and the shutter 9 provided on the front side thereof. As shown in FIG. 6, the filter frame 21 is rotatably provided about a shaft 22 provided on the mounting base 7, and its thrust direction deviation is caused by the surface of the mounting base 7 and the partition plate 9A of the shutter 9. It is configured to be restricted by contact with the back surface of the. The filter frame 21 has a shaft 2
2 has a protruding arm 21A on the side opposite to the filter 20, and the protruding arm 21A has the other end 23 of the filter insertion / removal member 23 having an operation knob 23A at one end as shown in FIG.
Can be engaged with the bifurcated protrusions 23B and 23C formed on the. Further, the operation knob 23A is movable along the outer circumference in the notch window 6A formed at the front end of the straight advancement cylinder 6.

When the operation knob 23A is moved, either one of the two-pronged protrusions 23B and 23C abuts on the protruding arm 21A of the filter frame 21 and presses and displaces the protruding arm 21A, so that the filter frame 21 moves on the shaft 22. It is configured to be rotationally displaced around. In the filter frame 21,
The movable pin 24 is planted through the circular relief groove 7D provided on the mounting base 7, and the movable pin 24 is provided between the fixed pin 25 and the movable pin 24 projecting from the back surface of the mounting base 7. As shown in FIG. 6, the toggle spring 26 is hooked.
The toggle spring 26 urges the filter frame 21 counterclockwise as shown in FIG. 6 when the operation knob 23A is set to the set position as shown in FIG. Is configured to be urged in the clockwise direction. Also, the filter frame-21
Is rotated counterclockwise by the urging force of the toggle spring 26, and when it comes into contact with the limiting pin 27 projecting from the mounting base 7 as shown in FIG. Is configured to. Further, the distance θ (see FIG. 6) between the bifurcated protrusions 23B and 23C is formed sufficiently large in relation to the safety switch device described below.

A flat plate portion 23D protruding inward is formed on the upper end of the filter inserting / removing member 23.
In addition, the sliding brush of the safety switch device 30 and the click spring 40 for disabling the shutter release while the filter frame 21 is moving are provided. Sliding brush 31
Is the three contact brushes 31a, 31b, 3 as shown in FIG.
The conductor lands 32a, 32b, and 32c, which are configured by 1c and can contact with each other, are arranged on an insulating substrate 33 provided on the shutter control device 10. The contact brush 31a is brought into contact with the conductor land 32a only when the operation knob 23A is at the left end in FIG. 8 of the cutout window 6A,
The contact brush 31b comes into contact and conducts with the conductor land 32b only when the operation knob 23A is located at the right end of the cutout window 6A, and the remaining contact brush 31c slides on the conductor land 32a that is long in the circumferential direction at all times. It is configured to be in contact with and conductive with this. Further, in the click spring 40 provided at the tip of the flat plate portion 23D, the operation knob 23A has the cutout window 6A.
When located at the left and right ends of the, the tip ends of the click grooves 41a and 41b formed on the insulating substrate 33 are configured to fall.

The contact brush 31a and the conductor land 32a constitute a first switch SW ₁ , and the contact brush 31b.
And the conductive land 32b constitute the second switch SW ₂ ,
As shown in FIG. 9, the power source E is connected in parallel. Both switches SW ₁ and SW ₂ are connected to the shutter control device via a release switch SW ₃ which is interlocked with a release button Br. In FIG. 9, reference numeral SW ₀ is a power switch.

Next, the operation of the above embodiment will be described with reference to the sub lens system L.
The insertion / removal of _{2 and} the insertion / removal of the filter 20 will be roughly described. In the wide-angle state shown in FIG. 1, the auxiliary lens system L ₂ is
Among them, as shown by the chain double-dashed line, the photographing is performed only by the main lens system L ₁ which is located at the retracted position outside the photographing optical axis and has a relatively short focal length. In this case, the distance to the subject is detected by an automatic distance measuring device (not shown), and the cylindrical portion 11A of the main lens system moving device 11 is rotationally controlled based on the detection signal. In accordance with the rotation of the cylindrical portion 11A, the main lens system L ₁ is extended along with the main lens frame 13 along the optical axis, and automatic focus adjustment is performed.

To switch from the wide-angle state shown in FIG. 1 to the telephoto state shown in FIG. 3, a switching control member (not shown) provided on the camera body 1 side is switched to the wide-angle position or the telephoto position. Then, the motor 3 rotates to rotate the pinion gear 4
The rotary lens barrel 2 rotates via the. The rectilinear lens barrel 6 screwed to the rotary lens barrel 2 via the helicoid screw 5 is rotated by the guide plate 19 shown in FIGS. 2 and 5 and the guide protrusions 7B and 7C of the mounting base 7 engaged with the guide plate 19. (See FIG. 4), the rotation of the rotary lens barrel 2 causes the helicoid screw 5 to lead to the right along the optical axis from the wide-angle position in FIGS. 1 and 2. As the linear lens barrel 6 is extended, the mounting base 7 moves integrally to the right.

When the mounting base 7 moves to the right, the engaging arm 15B of the filter frame 15 rotatably supported by the pin shaft 16 of the mounting base 7 is shown by a solid line from the position of the chain double-dashed line shown in FIG. Move to position. At that time, the engaging arm 15B
Moves in the downward direction (counterclockwise in FIG. 4) in FIG. 5 along the cam surface 19A by the urging force of the tension coil spring 17 hooked on the arm 15A of the filter frame 15. As a result, the filter frame 15 pivots counterclockwise around the pin shaft 16 from the position indicated by the chain double-dashed line in FIG. 4, and abuts against the projection 18 on the rear surface of the mounting base 7 to stop. At this time, the optical axis of the sub lens system L ₂ coincides with the optical axis of the main lens system L ₁ , and the photographing optical systems L ₁ and L ₂ have a predetermined long combined focal length.
In this case, the auxiliary lens frame 15 is in contact with the back surface of the mounting base 7 and is strongly contacted and supported by the arcuate projection 18 by the urging force of the tension coil spring 17, so that its position is reliably held.

Even in the telephoto state shown in FIG. 3, focus adjustment is automatically performed by moving out the main lens system L ₁ by rotation of the cylindrical portion 11A of the main lens system moving device 11. Further, in order to move the sub lens system L ₂ from the telephoto state shown in FIG. 3 to the wide angle state shown in FIG. 1, a switching operation member (not shown) may be set by switching from the telephoto position to the wide angle position. As a result, the motor 3 is rotated in the reverse direction, the rotating lens barrel 2 is rotated in reverse via the pinion gear 4, and the rectilinear lens barrel 6 is linearly moved leftward from the delivery position shown in FIG.
The engagement arm 15B of No. 5 slides along the cam surface 19A, and moves the filter frame 15 to the retracted position against the biasing force of the tension coil spring 17. Due to the rectilinear lens barrel 6 being retracted, the main lens system L ₁ along with the mounting base 7 is returned to the wide-angle position shown in FIG. Note that in both wide-angle and telephoto states, the main lens system L ₁ quickly moves to the reset position slightly retracted from the respective infinity in-focus positions immediately after the shutter 9 is operated and the photographing is performed. Returned to
Prepared for the next shoot.

Next, the insertion / removal action of the filter 20 and the action of the switch device 30 accompanied therewith will be described in detail with reference to the action explanatory diagram of FIG. In the filter insertion state shown in FIG. 10A, the filter 20 is inserted on the photographing optical axis as shown in FIGS. In this case, the operation knob 23A for inserting and removing the filter 20
Is placed at the filter insertion position at the left end of the cutout window 6A as shown in FIGS. 7 and 8, and the click spring 40 is recessed in the click groove 41a. Further, in this state, the moving pin 24 planted in the filter frame 21 holding the filter 20 is located on the right side of the center line X connecting the shaft 22 and the fixed pin 25 on the mounting base 7 as shown in FIG. It Therefore, the filter frame 21 is urged counterclockwise by the toggle spring 26 and is in contact with the restriction pin 27.

Further, in this state, the contact brush 31a of the control switch device 30 comes into contact with the conductor land 32a as shown in FIG.
The first switch SW ₁ constituted by 2a is placed in the ON state. However, the contact brush 31b and the conductor land 32
The second switch SW ₂ constituted by b and is in the OFF state. Therefore, as shown in FIG. 9, when the release switch SW ₃ is turned on after the power switch SW ₀ is turned on, the shutter control device 10 is supplied with power from the power source E, and the shutter 9 is opened and closed to perform photographing.

Next, in order to escape the filter 20 to the retracted position, the operation knob 23A may be changed rightward to the right end of the cutout window 6A. In this case, first, as shown in FIG. 10B, the play knob α is operated by the play angle α until one of the two forked projections 23B comes into contact with the protruding arm 21A of the filter frame 21.
While A is displaced, the contact brush 31a moves to the conductor land 32.
away from a, the first switch SW ₂ becomes the second switch SW
It turns off like step ₂ . Therefore, even if the release switch SW ₃ is turned on in FIG. 9, the shutter control device 10
Does not work. Therefore, the shutter 9 is not opened and closed, and the photographing is blocked.

Further, the operation knob 23A is displaced to the right,
When pushing the protruding arm 21A with one of the two-forked protrusions 23B,
The filter 20 together with the filter frame 21 starts retracting from the optical axis of photography. In this case, as shown in FIG. 10 (C), the moving pin 24 connects the center line X with the shaft 22 and the fixed pin 22.
Until it comes to the top, the filter frame 21 is biased counterclockwise in FIG. 6 by the toggle spring 26. Also,
Even in the state of FIG. 10C, the first switch SW ₁
Then, the second switch SW ₂ is turned off. Therefore, the shutter 9 does not operate even when the release switch SW ₃ is turned on.

When the operation knob 23A is further displaced rightward from the position shown in FIG. 10 (C), the moving pin 24 moves leftward beyond the center line X. Then, the urging direction of the toggle spring 26 is changed from the counterclockwise direction to the clockwise direction. Therefore, the filter 20 rapidly rotates in the clockwise direction together with the filter frame 21, and the moving pin 24 abuts against the left end of the escape groove 7D and stops, as shown by the chain double-dashed line in FIG. As a result, the filter 20 moves to the retracted position and stops as shown in FIG. In this case, the protruding arm 2
The displacement amount of 1A is the same as that of the protruding arm 21A and the other two of the forked protrusions.
Since it is slightly smaller than the play angle α with 3C, the protruding arm 21A does not collide with the other bifurcated protrusion 23C.
Therefore, even if the filter 20 is rapidly retracted from the photographing optical axis, the operation knob 21A is not impacted and the switching operation is smoothly performed. Even if the filter 20 moves to the retracted position as shown in FIG.
Both switch SW ₁ and second switch SW ₂ are off
It is left as it is.

Move the operation knob 23A from the position shown in FIG.
While moving by the play angle α, the second switch SW ₂
The contact brush 31b of the second contacting the conductor land 32b,
The switch SW ₂ is turned on, and the operation knob 23A is set to the escape position shown in FIG. 10 (e). In this state, the release button Br in FIG. 9 is pushed down to release the release switch S.
By turning on W ₃ , the shutter control device 10 can be operated and the shutter 9 can be opened and closed to take a picture. In the operation knob 23A, the tip of the click spring 40 has a click groove 41 when it comes close to the right end of the cutout window 6A.
It is positioned by falling into b.

In order to insert the filter 20 in the retracted position onto the photographing optical axis, the operation knob 23A in the filter retracted position as shown in FIG. 10 (d) is moved to the filter insertion position shown in FIG. 10 (a). You can return to. In this case, the filter 20 does not move until the operation knob 23A moves to the left by the play angle α. However, during that time, the second switch SW ₂ is turned off, and the shutter 9 does not operate even if the release switch SW ₃ is turned on. When the operation knob 23A is displaced to the left by the angle α, the other protrusion 23C of the forked protrusions 23B and 23C of the filter insertion / removal member 23 comes into contact with the protruding arm 21A of the filter frame 21 and is further displaced. The protruding arm 21 resists the biasing force of the spring 26.
6A is rotated counterclockwise from the position of the chain double-dashed line in FIG. When the operation knob 23A is further displaced leftward, the moving pin 24 moves rightward beyond the center line X. Then
The urging force of the toggle spring changes direction and the filter frame 21
Is urged counterclockwise. Therefore, the filter frame 21 is rapidly rotationally displaced counterclockwise, comes into contact with the limiting pin 27, and stops. However, even in this state, the first switch SW ₁ is not turned on, and even if the release button Br is pressed,
The shutter 9 does not operate. When the operation knob 21A further rotates to the left and a gap is created between the one arm 23B of the bifurcated protrusion and the protruding arm 21A by the play angle α, the operation knob 21A comes close to the left end of the cutout window 6A, As the tip of the click spring 40 falls into the click groove 41a as shown in FIG. 8, it is reliably positioned at the filter insertion position.

In the above embodiment, the switches SW ₁ and SW ₂ were used as safety switches for disabling the release. However, the signals of the switches SW ₁ and SW ₂
A correction circuit that corrects a change in the exposure value due to the insertion of a filter or a circuit that corrects a change in the optical path length may be controlled. As described above, in the filter insertion / removal operation, the gap for the movement amount α required to turn off the switches SW ₁ and SW ₂ is provided between the bifurcated protrusions 23B and 23C and the protruding arm 21A. When 20 is placed in the insertion position and the retracted position, one of the first switch SW ₁ and the second switch SW ₂ is turned on to enable the shutter 9, and the filter 20 is displaced. Both switches SW ₁ and S
It is possible to prevent the opening and closing of the shutter 9 by turning off W ₂ . Further, the filter frame 21 is attached to the mounting base 7
And the shutter partition plate 9A, and the movement in the thrust direction is suppressed by both planes,
While it is in the insertion position and the retracted position, it is surely held at that position, and even during the movement, it does not move in the plane orthogonal to the photographing optical axis and does not cause lateral shake. Its operation is extremely smooth.

In the above embodiment, the focus is adjusted by rotating the rotary cylinder 11A for moving the main lens system, and the focus is adjusted by moving only the main lens system in both the wide-angle state and the telephoto state. ing. However, the main lens system L ₁ is fixed to the mounting base 7 and
Is moved for focus adjustment in the wide-angle state, and when it is extended beyond the focus adjustment range, the auxiliary lens system L ₂ is inserted on the optical axis to enter the telephoto state, and further focus adjustment in the telephoto state. Also, it may be configured to be performed by moving the mounting base 7. In addition, since the bifurcated protrusions (23B, 23C) for moving the additional optical system such as the filter (20) and the protruding arm 21A on the filter frame side are relative, the action on the filter frame 21 side is two. It does not matter if a projection is provided and a projecting arm is provided on the filter insertion / removal member 23 side that moves the projection. A close-up lens may be inserted and removed instead of the filter.

[0028]

As described above, according to the present invention, the additional optical system and the sub-lens system which are inserted into and removed from the optical axis of the photographing are provided on the front surface and the back surface of the mounting base, respectively, so that both are inserted. In the retracted position, it can be held in a plane that is stable and perpendicular to the optical axis, and since the additional optical system is inserted close to the aperture / lens shutter provided immediately after the main lens system, There is an advantage that the outer diameter of the additional optical system can be made small and the taking lens barrel can be made compact.

Further, as in the embodiment, if a play with a large gap is provided between the bifurcated protrusion as the additional optical system moving means and the engaging arm on the side of the additional optical system that engages with this, this play is provided. The shutter release can be disabled during movement of the filter by activating the safety switch for blocking the shutter release. Further, as in the embodiment, if a cam surface fixed to the camera body side and extending in the optical axis direction is provided as an auxiliary lens system moving means, and an engaging arm that engages with this cam surface is provided on the auxiliary lens frame, There is an advantage that the sub-lens system can be surely driven by the mounting base to be inserted and removed with a simple structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a taking lens barrel showing an embodiment of the present invention in a wide-angle state.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a lens barrel of the taking lens when the taking lens shown in FIG. 1 is converted into a telephoto state.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a perspective view of the guide plate shown in FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is a perspective view showing a filter insertion / removal member and a contact brush attachment portion shown in FIG. 1. FIG.

8 is a plan view showing the control switch unit of FIG. 1. FIG.

9 is a shutter release prevention circuit diagram including the control switch of FIG. 1. FIG.

FIG. 10 is an explanatory diagram showing the relationship between the operation of the filter insertion / removal mechanism shown in FIG. 1 and a control switch.

[Explanation of symbols for main parts]

L ₁ …… Main lens system, L ₂ …… Sub lens system, 2 ………… Rotating lens barrel, 6 ………… Straight lens barrel, 7 ………… Mounting base, 9 ………… Aperture / lens shutter, 10 …… ... Shutter control device 15 ... Sub lens frame 15B ... Engaging arm 19A ... Cam surface 20 ... Filter (additional optical system) 21 ... Filter frame 21A ... Projecting arm 23 ... Filter insertion / removal member Additional optical system 23A ... Operation knob 23B ... Biant projection 23C ... Biant projection 26 ... Toggle spring 30 ... Control switch device 40 ... Click spring

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 7, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an additional optical system, such as a filter, which can be inserted into and removed from a photographing optical path.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, small cameras having many functions such as an automatic exposure mechanism, an automatic focus adjustment mechanism, a flash function and the like, which have good portability and can be easily photographed, have been widely used.
In these small cameras, it is considered that an additional optical system represented by a filter, a close-up lens, or the like, which is desired depending on the intention of photographing, the state of a subject, or the like, is detachably provided in the photographing optical path.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

However, in such a camera, since no safety measures are taken into consideration while inserting / removing the additional optical system into / from the photographing optical path, the shutter release is inadvertently performed. There is a possibility that it will happen, and as a result, unexpected shooting failures will occur.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a camera which does not perform inadvertent shutter release during insertion / removal of the additional optical system into / from the photographing optical path.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In order to solve the above problems, the present invention is capable of converting the focal length, and
A lens system (L1) and a second lens system (L2) different from the first lens system,
An additional optical system (20) which is insertable into and removable from the photographing optical path of the second lens system and achieves a function different from those of the first and second lens systems; and into the photographing optical path of the additional optical system. And a prohibition means for prohibiting the shutter release operation during the insertion and removal of.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Delete

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Delete

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

[0028]

As described above, according to the present invention, the shutter release is prohibited during the insertion / removal of the additional optical system into / from the photographing optical path. Failure can be prevented in advance.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Delete

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuyuki Kazami 1-6-3 Nishioi, Shinagawa-ku, Tokyo Nikon Oi Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. A main lens system capable of shooting alone, an aperture / lens shutter arranged immediately after the main lens system, and a lens shutter which is added on the photographing optical axis according to the movement of the main lens system in the optical axis direction. In a bifocal camera having a sub-lens system for focal length conversion, the photographing light is supported by supporting the main lens system and the lens shutter on the front surface and detachably supporting the sub-lens system on the back surface. An attachment base that is movable along an axis, and an additional optical system that is removably provided on the photographing optical axis between the lens shutter and the attachment base and that has a function different from that of the sub lens system, A sub-lens system moving means for inserting and removing the sub-lens system on the photographing optical axis according to the movement of the mounting base; and an additional optical system moving means for arbitrarily inserting and removing the additional optical system. Multi-functional bifocal camera featuring Mela. 2. The additional optical system is a filter or a thin close-up lens, which is attached to a holding frame (21) rotatable around an axis (22) provided on the front surface of the mounting base (7). The multifunctional bifocal camera according to claim 1, wherein the multifunctional bifocal camera is held. 3. The guide plate (19) for guiding the mounting base (7) in the optical axis direction of the photographing, wherein the auxiliary lens system moving means.
A cam surface (19A) formed on the above and an engaging arm (15B) provided on the sub lens frame (15) holding the sub lens system (L ₂ ) and engaging with the cam surface (19A). The multi-function bifocal camera according to claim 1, wherein 4. The additional optical system moving means has a protruding arm (21) provided on an additional optical system holding frame (21) rotatable about an axis (22) provided on the mounting base (7).
A), and an additional optical system insertion / removal that has a bifurcated protrusion (23B, 23C) that engages with the protruding arm (21A) at one end and an operation knob (23A) that can be operated from the outside at the other end. A toggle spring mechanism (24, 25,) for urging the member (23) and the additional optical system holding frame (21) in both directions of insertion and removal.
26) The multifunctional bifocal camera according to claim 1, characterized in that 5. The additional optical system insertion / removal member (23) includes:
While the additional optical system (20) is being inserted / removed, the safety switches (Sw ₁ , Sw ₂ ) that prevent shutter release are interlocked, and the bifurcated protrusions (23B, 23C) are connected to the safety switches (Sw ₁ , Sw). ₂ ) is switched to the OFF state, so that a relatively large play angle (α) is provided between the bifurcated protrusions (23B, 23C) and the protruding arm (21A) so as to engage with the protruding arm (21A). ) Is provided, The multifunctional bifocal camera of Claim 4 characterized by the above-mentioned.