KR0156267B1 - Apparatus of light shutter for a camera - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shutter zoom camera, in which a zoom lens is located within the lens block (1), and the lens block (1) has a sector gear (15) rotatably engaged with the lens block and the rotatable cam ring (14). Equipped. The cam ring and the sector gear are rotatable at constant axial positions.

The movable finder optical assembly 8 and the movable strobe assembly 9 can be moved in conjunction with the movement of the zoom lens. The zoom lens can be moved between the telephoto position and the wide end position as well as to the full lens folded position past the wide angle unit, and to the macro or close up position past the telephoto unit value.

When the camera is in macro mode, the prism P1 is inserted into the finder optics assembly to correct the parallax. The strobe assembly is movable to change the piece, and the optical wedge 4e is pivoted into the path between the light receiver 4 and the light emitter 3e.

A single cam plate 53 is provided for moving the finder assembly and the strobe assembly. The photographing opening portion 22b is selectively closed by the barrier plate 31a when the zoom lens moves to the fully folded position. The light blocking member 210 is provided to block light from flowing into the photographing optical assembly through the cam grooves 20 and 21. This shading assembly includes a flexible code plate 90 which surrounds the outer periphery of the cam ring 14 and provides positional information relating to the position of the zoom lens.

Description

[Name of invention]

Camera shading device

[Brief Description of Drawings]

1 is a schematic perspective view of a first embodiment of a lens shutter type camera having a zoom lens formed according to the present invention;

FIG. 2 is a front view of a macro correction optical member forming part of a distance measuring device together with a lens barrel block, a light emitter, a light receiver and a zooming motor forming part of the invention of FIG.

3 is a plan view of the apparatus of FIG.

4 is a cross-sectional view taken along the line IV-IV of FIG.

5 is a cross-sectional view of the apparatus of FIG. 2 along the line V-V of FIG.

6 is a longitudinal sectional view of a lens barrel block and two photographing optical lenses formed in accordance with the present invention;

7 is an exploded view of flat camring cam holes used to surround the front and rear lens groups of the imaging optical system of the camera of FIG.

8 is an exploded perspective view of a lens barrel block used in the camera of FIG.

9 is a cross-sectional view showing an optical arrangement for adjusting the focus of the camera when the camera is in macro mode.

FIG. 10 is an enlarged plan view of the prism, frame, (ie mask and one receiver lens) of the system of FIG.

FIG. 11 is a front view showing the assembly of FIG. 10. FIG.

12 is a cross-sectional view of an optical array used for the zoom lens of the two lens groups of the camera of FIG.

FIG. 13 is a schematic diagram showing a light emitter and a light receiver of a distance measuring device used in the camera of FIG.

14 is a cross-sectional view of an optical array of a system for adjusting the focus of a subject distance measuring system when the camera is in macro mode.

15A to 17A are vertical cross sectional views of a first embodiment of a finder optical system according to the present invention;

Fig. 15A is a side view of the finder optical system when in a wide field of view, at a small magnification position.

FIG. 16A is a top view of the assembly of FIG. 15A when the camera is in narrow field, large magnification mode.

FIG. 17A is a top view of the assembly of FIG. 15A when the camera is in the narrow-field large magnification position in macro mode.

15B, 16B, and 17B show aberrations of the respective engineering systems of FIGS. 15A, 16A, and 17A, respectively.

18A-20B are vertical cross-sectional views of a second embodiment of a finder optical system according to the present invention.

18A is a top view of an optical system when the camera is in wide-field small magnification mode.

19A is a top view of an optical system when the camera is in narrow field magnification mode.

FIG. 20A is a top view of an optical system when the camera is in narrow field macro macro mode. FIG.

18B, 19B, and 20B show aberrations for the finder optics assembly, respectively, at respective positions of FIGS. 18A and 20A.

Figure 21 is a plan view of a plate that can be attached to the finder block portion and strobe light emitting assembly of the present invention.

22 is a cross-sectional view taken along the line XXII-XXII in FIG.

FIG. 23 is a bottom view of the cam plate of FIG.

24 is a plan view of the apparatus of FIG. 21 with the cam plate removed.

25 is a cross-sectional view taken along the line XXV-XXV in FIG.

FIG. 26 is a sectional view similar to that of FIG. 26 except that the finder plate in the first position is shown.

FIG. 27 is a sectional view similar to that of FIG. 26, except that the finder plate is shown in the second operating position.

FIG. 28 is a cross sectional view similar to the one of FIG. 26 with the refractive prism actuating plate removed for convenience.

FIG. 29 is a front view of the apparatus of FIG. 25 shown in the position where the refractive prism actuating plate is inserted.

30 is a cross-sectional view taken along the line XXX-XXX in FIG. 29;

31 and 32 are cross-sectional views of the first embodiment of the optical barrier device along a plane perpendicular to the optical axis when the central lens frame opening is in the open open position.

FIG. 32 is a sectional view similar to that of FIG. 31 except for showing the optical barrier device when in the closed position. FIG.

33 is a cross-sectional view of the first embodiment of the optical barrier device according to the present invention, similar to that of the first embodiment of the optical barrier device shown in FIG.

FIG. 34 is a sectional view of the optical barrier device of FIG. 33 in the closed position, similar to that of the embodiment of FIG. 32;

35 is an exploded perspective view of the light shielding device positioned adjacent to the lens barrel block.

36 is a perspective view of a shading ring.

FIG. 37 is a cross sectional view along line XXXVII-XXXVII in FIG. 36;

38 is a cross sectional view of a second embodiment of a light shielding ring according to the present invention, similar to the one of FIG. 37;

Figure 39 is an exploded perspective view of one embodiment of a flexible printed circuit board (FPC) guide apparatus with the cam ring partially cut;

40 is a perspective view of the FPC board guide member of FIG.

41 is a cross-sectional view of the mechanical arrangement of the FPC board guide plate with respect to the space formed between the cam ring and the front lens group frame.

Fig. 42 is a side view of the FPC board showing the elongation (double dashed line) and deformation (solid line).

43 is a side view of a light shielding device used in connection with an FPC substrate.

FIG. 44 is an exploded or schematic view of the code plate showing the functional relationship between the conductive lands and the cam (ring and plate) grooves on the code plate with the lands and cam holes of the code plate shown on a flat cam ring.

FIG. 45 is a diagram showing the fixed positions located on the code plate and the zoom code on the code of FIG. 44. FIG.

46 is a front view of the operation switches of the camera according to the present invention.

Fig. 47 is a rear view showing a zoom lens operating switch of the camera according to the present invention.

48 is a plan view showing additional operation switches of the cameras of FIGS. 46 and 47;

49 is a schematic cross-sectional view showing the mode changeover switch according to the present invention in a first, non-operational position.

50 is a cross-sectional view of the mode switch and the macro button shown in the second, operating position.

Fig. 51 is a schematic diagram of a telephoto-wide selection switch of the camera of the present invention.

52 is a front view of a finder optical system lens having a plurality of bright frames.

53A is a perspective view of a double wedge-shaped prism used in the finder optical system of the present invention.

FIG. 53B is a top view of the prism of FIG. 53A. FIG. And

FIG. 53C is a right side view of the prism of FIG. 53A. FIG.

Detailed description of the invention

[Background]

[Technical Field]

BACKGROUND OF THE INVENTION Field of the Invention The present invention generally relates to a lens shutter type autofocus camera, and more particularly to a zoom lens system used as a photographing optical system, and a finder optical system and an electronic flash device (strobe) to zoom a zoom lens system. The present invention relates to a zoom lens type camera operated in conjunction with an operation. In other words, the finder optics and strobe operate in a manner that can cooperate with the zooming of the lens.

This application is related to application number 143,946, filed January 7, 1988, entitled Zoom Lens Driving System for Lens Shutter Camera, filed on the same date and assigned.

[Background]

In general, in a conventional lens shutter type autofocus camera (i.e., with a shutter between the lenses), it is impossible to change the focal length of the photographing optical system. Other lens shutter autofocus cameras have a dual focal length system that can be provided to change one focal length and can be selectively inserted into the imaging optical system.

Such a system is equipped with two focal lengths but it is only possible to use two focal lengths, for example wide and telephoto ranges, or for example standard and telephoto ranges.

Such cameras, despite the advantages of double focal length, are unable to cover the range of focal lengths between two extreme focal lengths, or the focal length between wide angle and intermediate telephoto focal lengths.

In such situations, previously, taking pictures using zoom lenses was only possible using a single-lens reflex camera.

However, since such a reflex camera is much more expensive and heavier than a lens shutter camera, it is not easy for a person unfamiliar with the use of such a single lens reflex camera freely.

Because these single-lens reflex cameras are heavy and large, they would generally be appreciated by the quality of high-quality photos taken with these cameras, but travelers and women who want to reduce the weight and volume of their carry-on luggage are such single-lens reflex cameras. Tend to hesitate the use of.

Thus, users who hesitate to use a relatively bulky single-lens reflex camera as described above have only two choices: (a) relatively small and far less able to control the focal length of the imaging optical system; Choose a light lens-shutter auto camera or (b) choose a dual-focal distance auto focus camera that only uses two focal lengths.

In view of this situation, one main object of the present invention is to provide a compact, lightweight, compact lens shutter camera having a zoom lens that can automatically perform focusing control and electronic flash or strobe control.

Another object of the present invention is to provide an additional macro, i.e. close-up function, which is capable of capturing very large, detailed images: the finder optical system and the electronic flash are in normal operation (e.g. wide angle, telephoto). In the macro mode, of course, the lens shutter type autofocus camera is adapted to be adjusted according to the zoom operation of the boom lens.

Another object of the present invention is to provide a movable macro correction optical member, which extends an engineering base length of a normal photographing method to a base length of a normal photographing method to measure a distance of a subject. It is used in a range finder or range finder to allow light to be received in substantially the same area on the position sensor.

Yet another object of the present invention is to provide a camera having a field of view with minimal parallax in macro mode.

Another object of the present invention is to provide a lens shutter by providing a prism in the path of the finder optical system which is selectively movable to refract the field of view downward and downward toward the axis of the photographing optical system when the camera is in macro shooting mode. It is to reduce the parallax of the type camera.

Furthermore, it is an object of the present invention to move the strobe lamp along the optical axis in accordance with the operation of the zoom lens.

It is still another object of the present invention to provide a distance measuring device for use in an autofocus lens shutter type camera in which an optical wedge is selectively inserted to extend an optical line length between a light emitter and a light receiver having a distance measuring device. It is.

Another object of the present invention is to provide a finder optical system that operates only one lens to change the field of view.

It is still another object of the present invention to provide a lens shutter type camera that minimizes light rays entering a photographing optical system.

It is furthermore an object of the present invention to provide a lens shutter type camera comprising a stroboscopic device in which an illumination angle changes depending on the position of the movable zoom lens assembly.

Another object of the present invention is to provide a structure for guiding the flexible printed circuit board (FPC) along the pressing side of the cam ring and the zoom lens in the operating state and minimizing internal reflection from the fusible printed circuit board into the imaging optical assembly. It is to provide a lens shutter camera included.

[Initiation of invention]

The present invention provides a lens shutter type camera having a subject distance measuring device, a photographing optical system driven in response to a measurement amount of a subject distance detected by the distance measuring device, a finder optical system independent from the photographing optical system, and a strobe. To provide.

The photographing optical system according to the present invention has a zoom lens assembly capable of continuously changing the focal length of the optical system: the finder optical system is independent of the photographing optical system and at a certain point of time the zoom lens system Accordingly, a variable magnification finder optical lens assembly capable of changing the field of view of the finder lens assembly is provided. The zoom lens system and the variable magnification finder optical system are driven by a single zooming motor.

With such a configuration, only the zoom operation and the shutter release operation are made manually, and as a result, a high quality compact automatic camera can be obtained.

The lens shutter type camera used in the present invention is equivalent to or better than a single-lens reflex camera as long as it is combined with a straw portion device, thereby providing an autofocus camera that is highly organized and easy to use and handle.

The strobe device may be of a type, for example, in which the irradiation angle is fixed, but a variable irradiation angle strobe device capable of changing the irradiation angle according to or in response to the variable focal length of the zoom lens system is preferable.

When the camera is designated in the macro mode according to the present invention, the zoom lens system can be partially or completely moved in the direction of the optical axis of the photographing optical system over one extreme range of the focal length.

Another feature of the present invention is that the finder optical system includes a variable magnification finder system including an optical member capable of changing the field of view, wherein the optical member changes the field of view according to or in response to a predetermined focal length of the zoom lens system. .

The finder system includes an optical member capable of refracting the finder optical axis toward the optical axis of the photographing optical system to correct the parallax in the macro mode of the camera.

Also in accordance with another aspect of the present invention, the stroboscope apparatus may vary the strobe irradiation angle depending on the focal length of the zoom lens system and in connection with or in response to moving or switching the zoom lens (photography lens) system to macro mode. Each strobe device is provided.

The subject distance measuring apparatus of the present invention can detect the subject distance by the conventional triangulation principle, and this method ensures accurate detection of the subject distance even when the camera is in the macro mode.

The distance measuring device includes an optical member capable of refracting the distance measuring ray to optically extend the base length of the measuring device in response to moving or switching the zoom lens system to the macro mode.

According to a first aspect of the present invention, a lens shutter autofocus camera includes a zoom lens that is continuously movable between a wide-angle end position and a telephoto end position.

The lens can be moved to a macro or close-up photographing position beyond the range of the telephoto position. And beyond the range of the wide-angle end position, the photographing lens is completely folded and the lens carriers are movable to a proximal position where the lens barriers are close to the openings of the lens barrier block.

The camera's viewfinder and stroboscopic angle change as the subject zooms in, as well as when the subject is shot at close range in macro mode.

The focusing can be controlled automatically in macro mode and in any range of the zoom lens.

The optical wedge is intended to be positioned along the light path of the distance measuring device forming the camera's automatic focusing system.

The prism is pivoted into the optical path of the finder optical system to correct parallax in macro mode.

The cam plate is driven by a single motor and is provided to drive the zoom lens through the cam ring. The cam plate is configured to drive the finder optical system and the strobe light emitting assembly in accordance with the zooming operation of the zoom lens.

In a second aspect, the present invention provides a lens shutter type camera having a zoom lens driven by a motor.

Furthermore, the camera is equipped with a finder optical assembly and a device for moving the finder according to the zooming operation of the lens to change the field of view through the finder.

In a third aspect, the present invention provides a lens shutter camera having a zoom lens driven by a motor, a movable strobe light emitting assembly having a variable irradiation angle, and a device for moving the strobe assembly according to the zooming operation of the zoom lens. .

In a fourth aspect of the present invention, a lens shutter camera is provided with a zoom lens driven by a motor, a device for driving a zoom lens over a range of telephoto position for close-up or macro photography.

The camera includes an autofocus adjusting mechanism having a subject distance measuring device for measuring the distance of the subject from the film surface of the camera by triangulation.

The rangefinder includes an optical wedge that is movable in the path between the light emitter and the receiver to extend the baseline length of the object rangefinder when the camera is assigned to the close-up mode.

A rotatable cam ring for receiving the photographic optical assembly is attached to the zoom lens, and the rotatable gear is positioned in the vicinity of the cam ring.

The cam ring engages the lower end of the optical member and includes a concave portion and an adjacent protrusion in front of the light receiver of the distance measuring device to pivot the optical member against a pressing force of a spring attached to the optical member.

The finder optics assembly and strobe assembly can be positioned in a plurality of positions in response to or in response to the continuous movement of the lens over a myriad of positions.

This is accomplished by using a code plate that determines 13 positions, including the telephoto position and wide angle unit values.

In a fifth aspect, the present invention discloses an auto focus camera having a lens that is movable to a macro position.

The camera includes a subject distance measuring device configured as a device for determining a distance of a subject from a film surface in the camera.

The camera also includes a photography dynamics system that automatically focuses along the detected subject distance.

The optical system can move to the telephoto position and beyond this telephoto unit to the macro or close-up position.

The object distance measuring apparatus includes an optical member and a device for selectively inserting the optical member into an optical path of the object distance measuring apparatus.

The optical member is located in a frame or mask to which the fusible correction flag is attached and the flag has a second free end at which one pivotally connects to the camera substrate and on which the correction optical member is located.

The cam ring includes a rotatable gear and includes a concave portion and an adjacent protrusion configured to pivot the flag so as to overcome the pressing force of the spring that continues to press the correction flag to a retracted position away from the light path of the light receiving member of the ranging device.

In still another aspect, the present invention provides a zoom lens adapted to be positioned in a camera. The lens comprises at least a first lens group and a second lens group, and an apparatus for positioning a photographing light system of the zoom lens at a wide-angle end position and a telephoto position. It includes.

The zoom lens further includes a device for moving only the first lens group to a position past the telephoto unit to provide close-up focusing of the imaging optical system when the camera is in macro mode.

In addition, another feature of the present invention includes a zoom lens having a wide-angle end position, a telephoto position and a plurality of variable magnification positions between the two extreme positions, as well as a telephoto unit value that can be positioned at a close-up position past the telephoto unit position. A camera is provided.

The camera includes an autofocusing device consisting of a light emitter and a light receiver, wherein the light receiver includes a first area used to detect the position of the subject when autofocusing for all lens positions except the macro position, and the second focusing apparatus. And a second area proximate to the area and including a device for detecting the position of the subject when the camera focuses the macro. These two regions may be the same or may overlap.

The camera may be composed of a zoom lens capable of moving between a wide-angle end position and a telephoto position, a plurality of variable magnification positions between these two positions, as well as a focusing position positioned beyond the telephoto unit value.

The camera includes a device for measuring a subject distance from a film surface of a camera including a light receiver and a light emitter.

The optical member may be selectively positioned in an optical path between the light receiver and the light emitter, and a motor is provided for driving the lens.

An apparatus is provided for driving connecting the motor to the lens and for placing the optical member between the light emitter and the light receiver when the lens is moved to the close-up position or the macro focusing position.

The lens shutter camera includes an active optical system having a zoom function and a macro function, and includes a first lens group having a negative refractive index composed of a positive lens and a negative lens, a second lens group including a negative lens, and a positive refractive index. And an independent finder optical system composed of a third lens group having a lens and a prism selectively fitted in an optical path between two lenses of the first lens group.

The prism includes an apparatus for refracting the optical path of the finder optical system toward the optical axis of the photographing optical system when positioned between the lenses of the first lens group.

In still another aspect of the present invention, a finder optical system is provided in a lens shutter type camera having a photographing optical system that can have a macro position.

The finder optical system is independent of the photographing optical system, and is composed of at least one lens and an optical member selectively fitted to the finder optical system when the photographing optical system, that is, the zoom lens, is in macro mode.

The optical member includes an apparatus for correcting parallax by refracting the optical axis of the finder optical system toward the optical axis of the photographing optical system.

A movable cam plate may be provided in this camera, which is driven by a motor. The cam plate consists of a substantially flat main part, a rack attached to the rear end of the main part and extending downward, and a plurality of grooves in the main part.

These grooves are parallax corrected cam grooves with non-projection sections, forward macro feed sections and macro fixed sections, strobe assembly guide grooves with wide-angle section and variable magnification section and telephoto section, and variable lenses with wide-angle section, telephoto section and variable magnification section. Consists of a guide groove.

In another aspect, the lens shutter type camera is composed of a photographing optical system including a zoom lens having a movable variable magnification lens group for changing the focal length of the optical system. An independent finder optical system is provided with a variable magnification lens group for changing the field of view of the finder according to the changing focal length of the zoom lens system. have.

The motor is provided to move the variable magnification lens group of the zoom lens system, and a single cam plate is moved in conjunction with the movement of the zoom lens. As the cam plate moves, the finder optical system is moved by the first driven plate that is engaged with one groove of the cam plate, and the strobe assembly is moved by a pin that is attached to the strobe assembly and engaged with the second groove of the cam plate.

A lens cap opening device for a lens support frame having an outer periphery, a central opening, and at least one barrier plate selectively covering the opening is provided.

The apparatus includes a movable member located at an outer circumferential opening of the frame, which is equipped with a device for selectively moving the member into the frame to cover the opening with at least one barrier plate.

A device is provided for selectively moving the member into the frame to cover the opening with at least one barrier plate.

The camera includes a zoom lens that can be moved by a drive motor to a collapsed lens position behind the wide-angle end lens position.

The lens is supported by an outer frame having a central imaging opening, and one or more marriage plates are provided to selectively cover the central opening. The camera includes a device for moving the barrier plate to cover the opening when the lens is moved to the lens storage position and opening the barrier plate at all other lens positions.

A light shielding device is used for a lens shutter type camera having a cam ring having at least one cam groove.

The cam ring is rotatable at a constant axial position, and the light shielding device includes at least one light blocking member positioned around the cam ring.

The light blocking member covers each cam ring groove and thus includes a device for preventing light from entering the inside.

In a lens shutter type camera having a cam ring rotatable at a fixed axial position and at least one movable lens barrel movable along the optical axis of the photographing optical system as the cam ring rotates, the front end of the cam ring support member and the lens barrel are A light shielding member is provided so as not to be fixed to any member in the space between the front cover having the opening to be moved. A flexible printer circuit board (FPC) is provided in the lens shutter type camera to transmit the operation signal from the camera body to the shutter block attached to the lens barrel which is axially movable within the camera.

A guide plate for an FPC has a front end having at least one bend and a rear end having a bend guide and attached to the camera body. The front end of the guide plate is attached to the shutter block. The lens shutter camera may also include an antireflection device attached to the flexible printer circuit board.

In another aspect of the invention, the lens shutter camera is movable along the axis of the imaging optical system and engaged by at least one lens group within the zoom lens to change the optical distance of the imaging optical system according to the rotational motion of the cam ring. Provided is such a zoom lens photographing optical system having a rotatable cam ring with a cam groove.

The cam ring includes zoom lens position information and includes at least one flexible code plate attached to the ring.

The above and other objects, features, and advantages of the present invention will be described in more detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements in the several figures.

Best Mode for Carrying Out the Invention

The invention will now be described in more detail below with reference to the accompanying drawings which illustrate various embodiments and features of the invention.

Descriptions will generally be given according to the following general subheadings:

A: Overall Camera Structure of Lens Shutter Camera

B: Rangefinder, ie rangefinder and its camera macro function

C: Finder Optical System

D: Finder and Strobe Drive

E: barrier, ie lens cap device

F: shading device

G: FPC Board Guide and Anti-Reflective Mechanism

H: Zoom lens position information detection mechanism

[A. Overall Camera Structure of Lens Shutter Type Camera]

The overall structure of the lens shutter camera according to the present invention is shown well in FIGS. The lens shutter camera according to the present invention includes a zoom lens barrel block 1, a finder and strobe block 2 (hereafter referred to as a finder block), a distance measurement, ie AF, a light emitter 3 forming part of the device; It consists of a light receiver 4 and a zoom operation motor 5 used for the string operation of the photographing optical system.

All of these members are fixed to the substrate 6 which forms the non-movable part of the camera body.

The substrate 6 includes a lens barrel support plate portion 6a that lies in a plane perpendicular to the optical axis of the lens, as shown in FIGS. 2 to 4.

The horizontal support plate portion 6b is provided so as to extend at right angles from the lens barrel support plate portion 6a.

As shown in FIG. 2, in order to support the finder assembly 8 and the strobe assembly 9, the support plate portion 6b extends beyond the side edges of the plate 6a.

The substrate also has motor support plate portions 6c positioned perpendicular to the horizontal flat support plate portion 6b.

The barrel block 1 is supported on the barrel support plate part 6a, which has a central opening (not shown) for housing the barrel block as shown in FIG.

The zoom motor 5 is attached to the motor support plate portion 6c and is located on the center portion of the barrel block 1.

Preferably, only such a single motor (eg, a DC motor) is used to drively couple all of the movable members of the system.

The distance measuring device includes a light emitter 3 and a light receiver 4, which are fixed to the horizontal support plate portion 6b of the substrate 6 and located opposite to the zooming motor 5. (See FIGS. 2 and 3).

The finder block 2 is fixed to the right side portion of the horizontal support plate portion 6b when viewed from the front of the camera as shown in FIG.

The gear row support plate portion 6e is connected to the motor support plate portion 6c through the spacer 6f as best shown in FIG.

The barrel block 1 is operated by the zoom operation motor 5, the structure of which will be described in more detail below with reference to FIGS.

The rear fixing plate 11 is fixed by the fastening screw 10 to the lens barrel support plate 6a as best shown in FIG.

The rear fixing plate 11 includes four guide rods 12 attached through the holes in the rear portion of the guide plate, which guide rods are located parallel to this axis around the optical axis of the imaging optical system. .

The front fixing plate 13 is fixed to the front end portions of the guide rods 12: these guide rods and the plates are the fixing members of the lens barrel block 1.

The rotatable cam ring 14 is positioned between the front fixing plate 13 and the rear fixing plate 11: the sector gear 15 is a substantial portion of the outer circumference of the cam ring 14 (but preferably not 360 ° overall). Is provided around the cam ring, which can be attached to the cam ring with a conventional device, for example with a screw 15a, as shown in FIG. As shown in the figure, the first pinion 7 (FIG. 1) is positioned directly or indirectly between the gear train support plate 6e and the motor support plate part 6c.

The gear 15 may be a stoker gear covering a predetermined range of the rotational motion of the cam ring 14.

The rotary recess 44a and the cam surface 44 are provided adjacent to each other on the flat part of the gear.

The cam ring is provided with zoom actuating cam grooves 20 and 21 (see FIG. 7) used to engage the front and rear lens groups, respectively.

7 is a schematic or exploded view of the zoom actuating cam grooves 20 and 21 of the ring 14. The cam groove 21 engaged with the rear lens group is a wide-angle end fixed section 21a, a variable magnification section 21b inclined upwardly (as shown in FIG. 7) from the section 21a, and a telephoto section 21c. ) Is included.

The cam groove 20 used for the front lens group has a barrier block 30, an opening and closing section 20a, a lens storage section 20b, a wide-angle end classical section 20c, a variable magnification section 20d, and a telephoto end fixing section 20e. , The macro switching section 20f, and the macro stage fixed section 20g are included. When the term macro is used herein, it refers to the close-up photographing method of the camera. Previously, the term macro has sometimes been used in the sense of being larger than its full size, but the term macro will be used herein as synonymous with close-up, and when this term is used it does not necessarily indicate the opposite. It is used with that meaning.

The total angle θ ₁ of the cam ring opening / closing section 20a of the zooming cam groove 20, the lens storage section 20b, and the rotational displacement of the wide-angle end fixing section 20c is fixed to the wide-angle end of the zooming cam groove 21. It is equal to the angle θ ₁ of the section 21a.

The angle θ ₂ of the variable magnification section 20d of the zoom operation cam groove 20 is equal to the angle θ ₂ of the variable magnification section 21 b of the zoom operation cam groove 21.

Further, the telephoto end fixed section (20e), macro over each (θ ₃₎ of the short-range forward section (20g), and macro conversion section (20f) are the same and each (θ ₃₎ of the telephoto end fixed section (21c).

In the illustrated embodiment, the zoom range is between about 35 mm and about 70 mm.

As shown in FIG. 6 and FIG. 8, the roller 17 is located in the zooming cam groove 20: This roller is attached to the front lens group frame 16. As shown in FIG.

The roller 19 of the rear lens group frame 18 is located in the zooming cam groove 21, as shown in FIG. 6 and FIG.

The front lens group frame 16 and the rear lens group frame 18 are movably guided by the guide rods 12, and the exterior frame 22 and the shutter block 23 are, as well as the cross-sectional view of FIG. 6. As best shown in the exploded view of FIG. 8, it is fixed to the front lens group frame 16 via a screw 22a.

The front lens frame 24 supporting the front lens group L1 is engaged with the shutter block 23 through the spiral 25 shown in FIG.

Since the front lens frame 24 includes an arm 24a that engages with the lens transfer lever 23a of the shutter block 23 (see FIG. 6), the lens transfer lever 23a is the front lens frame 24. When rotating in the circumferential direction to rotate the front lens frame 24 will move along the direction of the light tuft of the imaging optical system with the guidance of the spiral body 25. The rear lens group L2 is directly attached to the rear lens group frame 18 as shown in FIG.

As shown in FIG. 6, one preferred form of lens groups L1 and L2 is disclosed in US Patent Application No. 935,982, filed November 28, 1986.

The structure of the shutter block 23 is originally known. The shutter block rotates the lens transfer lever 23a at a predetermined angular displacement through a fillscoaster, as described later, in accordance with a detection signal received from the distance measuring device to the shutter block. The shutter sector 23b, which is engaged in the body and has been closed for a predetermined time, is opened, and after that, the lens transfer lever 23a is returned to its original position after the shutter is closed again.

A shutter block of this type is disclosed, for example, in Japanese Patent Application Laid-open No. 60-235,126 filed November 21, 1985.

The camera of the present invention uses such a shutter block in the basic manner disclosed therein.

The finder block 2 includes a finder device 8 and a strobe device 9. The finder device and the strobe device are respectively adapted to change the intensity of the finder field of view and the irradiation angle, that is, the strobe, in accordance with the change in the focal length of the lens barrel block 1. The zoom motor 5 is used as a power source for both finder control and strobe control: only one motor is used for it.

As shown in FIG. 1, the sector gear 15 of the cam ring 14 is engaged with the second pinion 50 different from the first pinion 7 mentioned above.

The shaft 51 to which the second pinion 50 is attached extends backward toward the rear portion of the substrate 6 and has a reduction gear train 52 adjacent to the rear end of the shaft. The reduction gear train includes a final gear 52a engaged with the rack 53a of the movable cam plate 53.

This generally flat cam plate 53 is slidable in the lateral direction as shown in FIG. 1 and includes a downward bend 53b at its rear end as best shown in FIG.

The rack is formed on the lower end of the bent portion of the cam plate.

The reduction gear train 52 is configured to decelerate and rotate the gear 15 to restrain or restrict the lateral movement of the cam plate 53.

The cam plate is provided with a variable magnification cam groove 55 for guiding the finder device 8, a parallax correction cam groove 56, and a stroboscopic cam groove 57 for guiding the stroboscope device 9.

The lens system used for the finder optical assembly 8 consists essentially of the subject-side lens group L3, the eyepiece group L4, and the movable variable magnification lens group L5. It has a refractive prism P1 used when it is placed in the close-up mode.

The variable magnification lens group L5 causes the screen to be changed according to the variable magnification operation of the barrel block 1 to match the field of view of the finder device 8.

Refractive prisms are used to control parallax that occurs in macro mode.

More specifically, the inevitable parallax when using a lens shutter camera increases as the subject gets closer to the camera, so a large parallax generally occurs in macro mode.

In order to solve this problem and reduce large parallax that may occur in the macro mode, the refractive prism P1 is provided in a wedge shape having a thick lower end and a thin upper end.

The refraction prism P1 refracts the rays downward in order to photograph a subject positioned extremely close to the camera when it is located along the optical axis of the finder optical system.

FIG. 28 shows an optical path of light rays when the refractive prism P1 is positioned along the optical axis of the camera.

As described below, the wedge prism used is preferably selected as a double wedge prism, which is wide in both the vertical and horizontal directions, as clearly shown in FIGS. 53a, 53b and 53c. This changes.

Such a prism refracts the rays downward and to the right so that they move in alignment with the photographic optic axis.

The stroboscope 9 constrains or constrains the irradiation angle when the focal length of the photographing lens is large, i.e. when the zoom lens is moved forward: the strobe apparatus 9 is also used in macro mode to reduce the amount of light reaching the subject. It is moved to increase the irradiation angle.

In the illustrated embodiment, the strobe device 9 is a fixed Fresnel lens L6, a movable concave reflector 59, and a xenon non-lamp 58 that can be moved along the optical axis of the strobe. It includes.

Optionally, a simple strobe can be used when the irradiation angle is fixed. Although such a stroboscopic structure is possible, it is preferable to move the lamp in the optical axis direction in accordance with the movement of the zoom lens in order to optimize the amount of light given to the subject at the time of photographing, depending on the position where the zoom optical system of the zoom lens is located.

[B. Macro function of rangefinder, ie rangefinder camera]

Prior to explaining the relationship with the macro function of the camera of the detailed configuration of the distance measuring device of the present invention, the relationship between the distance from the subject to the zoom lens of the two lens groups and the displacement or forward movement of the zoom lens will be described first.

12 shows a relatively simple structure for the zoom lens of the two lens groups. In such a structure, the subject distance and the displacement of the zoom lens have the following relationship:

Where U is the distance from the film plane to the subject:

f1 is the focal length of the first lens group:

X is the displacement of the zoom lens:

HH is the principal point distance:

Δ is the distance between the focal point of the first lens group and the focal point of the zoom lens of the second lens group.

From equation (1), it can be calculated as follows:

FIG. 13 shows the relation between the subject distance U and the positional deviation t on the position detecting member 4a, which is a distance from the film surface to the subject based on the principle of triangulation. Form part of the distance measuring device that detects. The triangulation type distance measuring device comprises a light emitter 3 including a light source 3a and a light emitting lens 3b: a light receiving lens 4b and a position detecting member 4a, for example, a photosensitive detector (hereinafter, PSD). And a light receiver 4 having

The light rays emitted from the light source 3a are reflected by the subject, and the light rays reflected therefrom are received by the position detection sensor 4a to detect the distance of the subject from the film surface F. As shown in FIG.

The difference between the image position on the film surface F of the subject at an infinite distance serving as a reference point on the watch detection sensor 4a and the image position on the film surface of the subject which is the distance U from the film surface F (t) ) Is given by:

Where L is the baseline length of the distance measuring device:

f is the focal length of the light receiving lens; And

d is the distance between the film surface F and the focal plane of the light receiving lens.

The deviation t can be detected by the current, that is, the output of the position detection sensor 4a according to the amount of light received by the position detection sensor 4a in a known manner.

The photographing optical system of the camera is adjusted to form an image on the focal point of the image plane according to the output signal of the position detection sensor 4a, that is, the current, based on equations (2) and (3), and thus autofocusing. Adjustment can be made.

The operation or drive of the imaging optical system is mentioned above.

In order to perform the macro function of the camera, it is necessary to move the measurement range of the subject distance by the distance measuring device toward the distance of the near subject.

In macro mode, it is well known that the imaging optical system is partially or completely displaced from the standard position towards the subject.

In the embodiment of Fig. 12, the first lens group of the photographing lens is moved forward to a predetermined displacement toward the subject in the macro mode, which is independent of the displacement made by the autofocus control device during normal photographing.

14 shows one mechanism for converting the measurement range of the object distance in the macro mode according to the present invention.

In Fig. 14, the prism P, which is a normal work having the vertex angle δ, is inserted in front of the light receiving lens 4b to move the measurement range of the object distance toward the photographed subject.

In other words, the zoom lens type camera system uses a pivotable prism or wedge positioned in front of the light receiver 4.

For example, assuming that the vertex angle and refractive index of the prism P are δ and n, respectively, the deviation t1 of the image on the position detection sensor 4a with respect to the object distance U1 can be obtained as follows:

First, the incident angle α of the light beams on the plane of the prism P proximate to the subject is determined by the following equation:

The refractive angle β of the light rays incident on the prism P of the vertex angle n at the incident angle α is determined by the following equation:

Therefore γ = α-δ-β.

Therefore, the deviation t1 of the image on the position detection sensor 4a is

t1 = f x tan γ will be determined.

If the object distance Umf1 obtained when a light ray coinciding with the optical axis of the light receiving lens 4b crosses the optical axis of the light emitting lens 3b is ignored as follows, the thickness of the prism P is determined as follows:

In one example, the inventors of the present application computed the values of U, U1, t, t1, and t-t1 for a camera with an imaging optical system that includes a zoom lens of two lens groups. f1, that is, the focal length of the first group is 24.68 mm; HH, i.e., tavern distance is 7.02 mm; Δ, that is, the distance between the focal point of the first lens group and the focal point of the zoomlems is 30.04 mm; d, i.e., the distance between the film surface and the focal plane of the light receiving lens is 6.292 mm; The displacement of the first group in the macro setting is 0.5502 mm; L, that is, the baseline length of the distance measuring device is 30 mm; f, that is, the focal length of the light receiving lens is 20 mm; δ, that is, the vertex angle of the prism P is 2.826 °; n, that is, the refractive index of the prism P is 1.483; The measurable distance ranges from 0.973 m to infinity;

The number of steps of the forward movement of the zoom lens is 18 so that the range of 0.973 m to 6 m is divided into 17 forward movement steps of the zoom lens.

The results of these calculations are shown in Table 1 below.

In these calculations, the distance range of 0.973 m to 6 m is shifted to the range of 0.580 m to 1.020 m.

In Table 1 below, steps 17-18 represent transition points that change to step 18: Similarly, steps 0-1 represent transition points between 0 and 1 step.

As can be seen from Table 1, as a result of the correction by the prism P, an image deviation of 0.027 mm occurs in the position detection sensor 4a at both ends of the measurement range of the measurable subject distance.

Such deviation substantially coincides with approximately one step in the number of steps of the zoom lens.

Therefore, it is impossible to move the photographing lens to the correct focus by directly controlling the displacement of the photographing optical system in response to the output of the position detecting sensor 4a, so that a state of out of focus occurs.

In other words, since the rate of change of the image deviation t1 on the position detection sensor 4a with respect to the subject distance U1 cannot be changed by the prism P, only the prism P is used to completely correct the deviation of the image. It is impossible to do.

Prism begins to correct for image drift, but cannot do so alone.

In view of such results, since the reduction amounts of the deviations t and t1 between steps 17-18 and 0-1 are 0.5334 mm and 0.4794 mm, respectively, the ratios of steps 0-1 and 0-1 to the ratio of deviations t1 are obtained. Multiply by 1.1130 (0.5334 divided by 0.4794) equal to the change in deviation t from step 0-1 to step 17-18 divided by the change in deviation t1 between steps 17-18. The inventors have found that a complete correction of such deviation can be achieved if the ratio of the deviations t is adjusted.

To this end, in the present invention, the macro mode correcting optical member is designed to optically extend the base line length between the light emitter and the light receiver of the ranging optical system, and to cross the light axis of the light emitter and the optical axis of the light receiver as a finite distance. Is moved to the front of the ranging optics only when is in macro mode.

Furthermore, in this embodiment, an actuation mechanism is provided to move the macro correction optical member to the front of the receiver in relation to switching or moving the photographing optical system, i.e., the zoom lens from the normal photographing mode to the macro mode. This will be described in detail later.

9 shows the optical arrangement of the distance measuring device when the autofocus camera of the present invention is in the macro mode.

In this figure, the macro correction member 4e is composed of not only an optical wedge of FIG. 14 but a prism 4c and a mask or frame 4d.

The member 4e is moved forward of the light receiving lens 4b of the ranging apparatus when the camera is set to the macro mode.

In the normal photographing mode, the member 4e is retracted away from the optical axis of the light receiving lens 4b.

Prior to explaining the mechanical structure for operating the correction member 4e, the actual structure of the macro correction member 4e and the reason why the measurement accuracy is improved or increased in the macro mode will be described in detail.

The member includes a prism 4c adapted to optically extend the baseline length of the ranging device and to refracting incident light.

10 shows the prism 4c, the mask 4d, and the light receiving lens 4b in detail.

11 is a front view of FIG. 10; These two figures show how the mask or frame 4d can block light rays off the optical path approaching the prism.

The mask 4d has a rear opening 4g (see FIG. 10) in front of the frame in which the front opening 4f, which is generally shown in the shape of a rectangular elongated slot, is located very close to the subject. It is included in the frame or mask side close to 4b).

The opening portion 4f has a slit shape spaced apart from the optical axis 0 of the light receiving lens 4b by a distance l measured from the light emitting lens 3b to the opposite side of the optical axis.

The rear opening 4g also has an elongated slit shape which is located along the optical axis 0 of the light receiving lens 4b.

With the mask 4d, when the prism 4c is moved forward of the light receiving lens 4b, that is, when the camera is in macro mode, the first lens group of the photographing lens is in the normal shooting mode by the auto focusing device. Regardless of the displacement of the lens, the lens is forwarded by a certain range.

As best shown in Figs. 9 and 10, when the prism 4c is positioned in front of the light receiving lens 4b, the measurement range of the object distance can be shifted to the macro mode range.

Since the prism 4c moves parallel light rays to a place separated by the displacement L in the direction of the base length, the base length L can be optically extended to the length L + L.

If the angle and refractive index of the prism 4c are δ and n, respectively, and the parallel movement of the light beams by the prism 4c is represented by the length ℓ, as shown on the position detecting member 4a with respect to the object distance U, The deviation t of the image can be obtained as described below.

The incident angle α of the light beam with respect to the plane of the prism 4c adjacent to the subject is given by:

This equation indicates that the base line length of the triangulation distance measuring device extends from L to L + L by insertion of the prism 4c in front of the light receiving lens 4b.

The refraction angle β ₁ of the light beam incident on the prism having an angle δ ₁ at the incident angle α ₁ is calculated according to the following equation:

Therefore, γ ₁ = α ₁ -δ ₁ -β ₁ .

Therefore, the deviation t ₂ of the image on the position detection sensor 4a is f × tan γ ₁ ,

That is, t ₂ = fx tan γ ₁ .

The object distance Umf ₂ obtained when the light ray coinciding with the optical axis of the light receiving lens 4b intersects with the optical axis of the light emitting lens 3b is calculated by using the following equation if the thickness of the prism 4c is ignored.

Table 2 below shows the calculation results, in which the distance measuring device of FIGS. 10 and 11 is applied to a photographing lens that satisfies the same basic conditions as mentioned for the embodiment of FIG.

That is, the conditions are as follows.

(a) the photographing lens is a group 2 lens;

(b) f1, ie the focal length of the first group is 24.68 mm;

(c) HH, i.e. tavern distance is 7.02 mm;

(d) Δ, that is, the distance between the focal length of the first lens group and the focal length of the zoom lens is 30.04 mm;

(e) d, that is, the distance between the film surface and the focal plane of the light receiving lens is 6.292 mm;

(f) the displacement of the first lens group in the macro setting is 0.5502 mm;

(g) L, ie the baseline length of the distance measuring device is 30 mm;

(h) f, that is, the focal length of the light receiving lens is 20 mm;

(i) δ ₁ , ie the angle of prism 4c is 3.39 °;

(j) n, that is, the refractive index of the prism 4c is 1.483;

(k) 1, i.e., the distance representing the translational displacement of the rays, is 3.39 mm;

(l) the measurement range of measurable subject distance is from 0.973 m to infinity;

(m) the number of steps of the forward movement of the zoom lens is 18;

(n) the range of 0.973 m to 6 m is divided into 17 steps; And

(o) The photographing range of 0.973m to 6m is shifted to the range of 0.580m to 1.020m.

It will be clearly understood that the deviation of the images on the position detection sensor 4a at various stages between the normal shooting mode and the macro mode is within +/- 0.0001 mm from Table 2.

This is indicated by the value (t-t) of the last column of Table 2.

Therefore, by adjusting the photographing optical system according to the output of the position detection sensor 4a, an image can be almost completely formed at the focus.

Table 2 shows that the prisms 4c can optically extend the baseline length, which is usually 30 mm in normal shooting mode, to be 1.113 times the normal baseline length in macro mode, ie the baseline length is 33.39 mm when the camera is in macro mode. Becomes; As a result, the displacement of the position detection sensor 4a can be increased by 1.113 times.

In operation, by operating the above-described shutter unit 23 according to the output signal transmitted by the position detection sensor 4a, that is, measurement data, the camera is automatically operated within the zoom operation range, including the macro mode of the camera. To adjust the focus.

Specifically, when the driving pulse is applied to the pulse motor of the shutter unit 23 in accordance with the measurement data received from the detection sensor 4a, the lens operation or the transfer lever 23a, as shown in Fig. 8, In order to rotate the front lens frame 24 together with it, it rotates by an angle corresponding to the received driving pulses. As a result of this rotation of the front lens frame 24, the front lens group L1 is moved in the direction of the photographing optical axis through the operation of the spiral 25 so that the focusing adjustment of the photographing lens assembly is made automatically.

The lens barrel block 1 rotates the cam ring 14 when the zoom operation motor 5 is driven.

Rotation of the cam ring causes the roller 17 of the front frame 16 to engage the macro end position fixing section 20g of the cam groove 20.

That is, the roller moves from the macro switching section 20f of the cam ring 14 to the section 20g so that the front lens group L1 moves further forward to move to the position for the macro mode operation of the camera.

As clearly shown in FIGS. 1 and 2, the macrocorrection member 4e is pivotally pivotable to the substrate 6 of the camera at its base via an axis 41 positioned below the light receiver 4. It is fixed to the free end of the attached flexible correction flag 42.

The flag 42 is normally supported in a substantially upright position when no external force is applied to the flag, and is elastically deformed even when an external force is applied to the flag.

Further, the protrusion 43 attached to the shaft 41 and having a pointed surface in the opposite direction to the flag may be integrally formed with the flag and attached to the shaft 41 or formed separately from the flag. And may be attached to the shaft 41 at the central hole of the projection.

As shown in FIG. 2, the macro correction member 4e is continuously rotatably pressed by the tension spring 46 to the retracted position which is retracted away from the optical axis of the light receiver 4.

As better shown in FIG. 1 and as shown in FIG. 2, the cam ring 14 causes the macro correction optical member 4e to move to the receiver of the optical axis of the distance measuring device whenever the cam ring 14 is rotated to the macro setting position. A projection 44 is included on the sector gear 15 (or cam ring) that meshes with the flag projection 43 to move forward of 4).

As shown in FIG. 1, a semi-cylindrical recess 44a (or other recess shape) is provided on the gear 15 adjacent to the cam face or protrusion 44.

This recess is easily provided for pivoting or rotational movement of the flag protrusion 43 as the cam ring rotates. In other words, the recess 44a facilitates the rotational movement of the projection, and is therefore necessary for pivoting or rotating the optical member 4e in front of the light receiver 4 at the position shown by the dotted line in FIG.

Optionally, the ring 14 or gear 15 may be formed with a smaller diameter to provide sufficient pivot space for the protrusion 43.

The cam protrusion 44 causes the macro correction optical member 4e to rotate or move forward through engagement with the protrusion 43. The cam protrusion 44 slightly adjusts the position where the optical member 4e is aligned with the optical axis of the light receiver 4. It is positioned and formed to rotate past.

However, the flat end of the member 4e, which is very close to the support plate 6e attached integrally to the substrate 6, has the shock absorbing nubs or buttons 4g shown in FIGS. Through (as shown in FIG. 2), the left side of the plate 6e is engaged.

Therefore, excessive rotational movement of the member 4e by the protrusion 44 is engaged with the flexible flag 42 and / or the side edges of the plate 6e formed of elastic plastic, rubber, or other elastic material. It is absorbed by the nub 4g.

Thus, when the cam ring 14 moves to the macro setting position, the macro correction optical member 4e automatically moves between the light receivers 4 to optically extend the base line length between the light emitters 3 and the light receivers 4. In order to scientifically extend the base line length of the sensor, it can be automatically entered into the front position of the receiver which is aligned with the optical axis of the receiver 4 in a straight line.

[c. Finder Optical System]

The finder optics system is best shown in FIGS. 1 and 15-20.

The finder optics system is designed not only to change the magnification between the low magnification wide field and the large magnification narrow field according to the zooming operation of the photographing lens system, but also to provide a smaller field of view when the camera is used in macro mode. have.

One of the important features of the present invention is that, as stated, the finder optical system can be moved automatically in conjunction with both the movement of the photographing lens to the macro setting state and its zoom operation to satisfy all the requirements of the finder system. will be.

Although the conventional finders have a plurality of bright frames with different size of view fields, this is not a satisfactory solution to the above mentioned problems. In other words, only the use of such frames does not minimize parallax in macro mode to the same extent as used in the camera of the present invention.

Under such circumstances, and in accordance with the present invention, a finder device equipped with an improved inverted Galiean Finder is provided for a lens shutter type camera including a zoom lens.

In other words, the finder optical system of the present invention comprises a first lens group of negative refractive index composed of a positive lens in the form of a fixed lens L3 and a negative lens in the form of a variable magnification lens L5. , A second lens group including the negative lens L4-1 which is one lens of the fixed eyepiece group L5, and a lens of a refractive index L4-2 which is the second lens of the fixed eyepiece group L4 And a third lens group including the lens.

The prism P1 is selectively moved between the positive lens L3 and the negative lens L5 of the first lens group to refract the light beam toward the optical axis.

The negative lens L5 of the first lens group may be displaced from a position adjacent to the subject to a position adjacent to the photographer's eye in order to change the magnification from the small magnification wide field of view to the large magnification narrow field of view.

The prism P1, which is optionally aligned with the optical axis of the finder optical system, is moved when the photographing optical system is in the macro setting state and when the first group of negative lenses L5 moves along the optical axis to be closest to the photographer's eyes. Reduces parallax

Bright frames shown in dashed lines in FIG. 52 form a photographing range and are the surfaces of the third group of lenses closest to the subject, that is, FIGS. 15A, 16A, 17A, 18A, and 19A. 20A and 20A are formed on the left surface A of each fixed eyepiece L4-2.

These yellow frames, which lie on the lens surface A, are located at the center autofocus point (located on the main part of the subject), a large image area frame (for normal photography with a zoom lens), and a smaller parallax correction frame ( Used in macro mode because the image area is slightly narrower).

Furthermore, since the surface B of the second lens group L4-1, which is closest to the photographer's eye, is formed of a translucent material, the virtual image of the bright frame formed of translucent portion is the third lens group L4. It can be seen through the positive lens of -2).

The yellow bright frames are located in front of the fixed eye lens L4-2, for example by sputtering: the rear of the eyepiece member L4-1, ie the surface B or r6, is translucent. It may be in the form of a semi-reflective concave mirror. Light rays from the bright frames (ie reflected by them) are reflected back by the concave surface R6 to focus on the observer's eye.

The eye perceives the enlarged virtual image of the frames in the far foreground position, which are formed through the optical effect of the lenses L4-1 and L4-2.

Since the first group of negative lenses L5 is movable as mentioned above, in order to increase the focal length of the photographing optical system during the normal zoom operation so that the magnification can be changed from the small magnification wide field of view to the large magnification. Moves from the position close to the subject to the position close to the photographer's eyes.

When photographing in macro (over-telephoto) mode with narrow field magnification, the prism is inserted between the movable lens (L5) and the fixed lens (L3) to reduce parallax, so that the beam Refract towards the position.

That is, as shown in FIGS. 16A, 17A, 19A, and 20A, in order to pivotally or rotatably insert the prism P1 for macro focusing, i. Sufficient space is provided to pivot the prism upward for movement.

The advantage of this system is that it is not necessary to correct the zoom movement of all the lenses since the zoom operation of a plurality of lenses or all lenses is performed only with a single moving lens L5.

This simplifies the structure of the zoomed cam plate because it is sufficient to change the magnification of the moving finder image of only a single lens.

As shown in FIG. 52, a fixed view frame is provided to avoid having to adjust the view.

The two rear eyepiece groups L4-1 and L4-2 containing the frames are fixed and the curvatures of their respective surfaces are compatible with the image magnification over the viscous range of the zooming operation of the photographing lens. It is controlled to have a predetermined magnification possible.

The vertex angle of the selectively insertable prism is defined by the composite angle in the horizontal and vertical directions depending on the positions of the finder system and the imaging optical system.

The prism may be a single wedge prism or a double wedge prism P1 that is convenient to bend the beam downward and downward toward the optical axis of the imaging optical system as shown in FIGS. 53A, 53B, and 53C. Can be.

As shown in FIG. 53, the double wedge-shaped prism P1 has a surface that also extends from left to right, as in the direction of arrow A (FIGS. 53A and 53C) at the top.

In the illustrated example, the angle θ is 2.8 °, the angle θ is 4.2 °, the angle θ is 4.2 °, and the angle θ.

The wedge-shaped prism is rotatably inserted between the first single convex lens member L3 and the movable single lens member L5.

This allows the finder device to be made compact and the prism can be inserted between these two members.

The view distance and bright frames of the subject's virtual image remain constant over the zooming range of the photographing lens, and parallax correction is provided by moving the prism between the lenses in the macro or close-up mode.

The viewing magnification or size of the bright frame images is kept constant throughout the zoom operation range of the photographing lens as well as at the macro setting due to the arrangement of the bright frames on the fixed lens member L4-2.

The distance between the photographer's eye and the image distance, i.e., the multiopter of the finder, is virtually unchanged since the zoomed concave lens member moves beyond the image magnification of 1x, i.e., the full size.

In macro or close-up shooting mode, parallax correction uses wedge-shaped prisms between lens members, in addition to the use of the marking for the correction frame shown in Fig. 52 (which is a general parallax correction device in the close-focus control method of the viewfinder camera). By positioning.

The edges of the wedge-shaped prism are tinted green to emphasize the frame showing the shooting area in macro or close-up mode.

In theory, the prism may be located in front of the first lens group, but if the prism is so arranged, it may increase the overall size of the finder scientific system.

However, the prism cannot be located between the second and third lens groups because when the prism is inserted between them, the position of the bright frame and the virtual image of the subject may change with the movement of the prism.

However, when the prism is retractably inserted between the positive lens and the negative lens of the first lens group as in the case of the present invention, the prism is free from such problems, and the change of the diopter to the virtual image of the subject occurs essentially at all. I never do that.

Some examples of finder optical systems formed in accordance with the present invention will now be described.

Example 1

15A, 15B, 16A, 17A and 17B show various positions of the first embodiment of the finder device formed according to the present invention.

Figure 15a shows a finder optical system when a small magnification wide field of view is provided:

Figure 16a shows a finder system when a large magnification narrow field of view is provided:

17A shows the finder system when a large magnification narrow field of view is provided and in macro mode.

15B, 16B and 17B show aberrations of the finder lens system at respective positions of FIGS. 15A, 16A and 17A, respectively.

The finder optical system includes a single positive lens L3 and a single negative lens L5 forming the first lens group; A single eyepiece lens L4-1 forming a second lens group; And a single eyepiece lens L4-2 forming a third lens group, and an optionally positionable prism P1.

Between these optical members, only a single negative lens L5 is movable along the optical axis direction; Prism P1 is selectively movable to be aligned in alignment with this optical axis; All other lenses remain fixed.

Tables 3 and 4 below show the curvature r, the distance d, and the refractive index Nd of the opposing surfaces of each of the optical members L3, L5, L4-1, L4-2, and P1 (Table 4 only). And Abbe's number (vd).

As shown in Tables 3 and 4, each of the values r, d, Nd and vd is viewed from the side of the single positive lens L3 closest to the subject, i.e. from the left part of the figures, the eye or the figure. Towards the right side of the field, one of the numbers 1 to 8 and 1 to 10 is designated, respectively.

Table 3 shows the lens position when in small magnification (0.38 ×), in wide field of view and in large field of view (0.70 ×), and in narrow field position. Table 4 shows the lens position when in macro mode. It is shown.

The vertices of the prism P1 constituting the double wedge prisms used in this mode are, for example, 2.8 ° in the horizontal section and 4.2 ° in the vertical section.

The bright frame forming the photographing range is displayed on the surface A of the single positive lens L4-2 of the third lens group closest to the subject, and the bright frame of the second lens group closest to the photographer's eyes. The surface B of the single negative lens L4-1 is translucent. As a result, the virtual image of the bright frame displayed on the surface A of the single positive lens L4-2 is formed and reflected on the surface B, and is then enlarged and viewed through the single positive lens L4-2.

Example 2

18A shows a second embodiment of a finder optical system in a wide field of view, at a small magnification position; 19 shows this embodiment in narrow field, large magnification position; Figure 20a shows a finder optics assembly in narrow field of view, large magnification, macro mode; 18B, 19B, and 20B show aberrations of the finder lens system at three different positions shown in FIGS. 18A, 19A, and 20A, respectively.

In the second embodiment of the finder optics, as long as the third lens group is composed of two lenses forming the positive lenses L4-2 and L4-3, the lens system is discussed in Example 1. Different from that of the first embodiment.

Tables 5 and 6 are tables similar to Tables 3 and 4 previously discussed with respect to the first embodiment of the finder optical system, with curvature r and distance d for all members of the second embodiment of the finder lens system. ), Refractive index (Nd), and Abbe's number (νd) are shown.

In Table 5, which shows the wide field of view of the system, the small magnification (0.35 ×) position, and the narrow field of view of the system, the large magnification (0.648 ×) position, and Table 6, which shows the system when in macro mode, The vertex angle of the prism P1 is, for example, 3.0 ° in the horizontal direction and 5.0 ° in the vertical direction.

The bright frame defining the photographing range is also formed on the surface A of the third group of positive lenses L4-2, and the surface B of the second group of single sub-lenses L4-1 is further formed. It is translucent as in the finder system of one embodiment.

As shown in Fig. 17A, the finder optical system of the present invention preferably satisfies the following conditions;

(1) 0.3 dP 0.5;

(2) f1 + 1.8: and

(3) 0.45 f 3 / LD 0.7;

LD = total length of finder;

dp = distance between the surface of lens L3 closest to P1 of the prism and the surface of lens L5 closest to prism P1;

f1 + = focal length of the positive lens of the first lens group;

And,

f3 = focal length of the third lens group.

These conditions are suitable for allowing the prism P1 to be rotatably inserted between the movable lens L3 of the first lens group and the negative lens L5 of the first lens group, and be placed in alignment with the optical axis. It is convenient to minimize the effective diameter of the prism at the time.

In the first condition, that is, 0.3 dP 0.5, if the value of dP exceeds its upper limit, the effective diameter of the lens L3 becomes large, making it difficult to provide a compact camera as in the present invention; On the contrary, if the value of dP is less than 0.3, the prism P1 is aligned with the optical axis at the position between the lenses L3 and L5 and rotates it smoothly and easily so that it can retreat away from the axis. It is based on the fact that it is extremely difficult to make.

The second and third conditions, i.e., f1 + 1.8 and 0.45 f3 / LD 0.7, are provided to minimize the effective diameter of the prism P1.

The second condition mentioned above generally corresponds to setting and positioning the focal length FR of the lens system which is located behind the prism P1 when the prism is aligned with the finder optical axis. That is, if f1 + exceeds the above-mentioned upper limit, 1.8, the effective diameter of the prism becomes large, thereby causing difficulty in realizing compact prisms and finders.

The third condition is basically equivalent to the requirement for the third lens group positioned behind the prism. In other words, if f3 / LD is smaller than the lower limit, 0.45, the tolerance of the system becomes very small.

On the contrary, if the value of f3 / LD exceeds the upper limit, 0.7, the effective diameter of the prism increases.

In the above first and second embodiments, the values of dp, f1 +, and f3 / LD are listed in the table below.

The above-mentioned first, second, and third conditions are satisfied.

[D.finder and strobe device drive]

The drive for operating the finder optics assembly 8 and the strobe assembly 9 is best shown in FIGS. 21 and 30.

A mother plate 60 is attached to a finder block 54 mounted to the substrate 6 via a horizontal support plate extension 6b.

Guide pins 62 are integrally attached to the mother board and fitted into a generally straight guide groove 61 of the cam plate 53.

The cam plate 53 is slidably transversely with respect to the optical axis of the camera and is constrained by the engagement between the guide grooves 61 and the guide pins 62; Guide protrusions or flanges 60a (shown in FIGS. 21 and 22) are integrally formed with the mother board and the cam plate 53 is from the front of the mother board, in particular of the cam plate 53 with the flanges engaging the cam plate. At the front end, it prevents it from floating or moving away.

The finder base plate 60 includes a variable magnification lens guide groove 63, a refractive prism guide groove 64, and a strobe assembly guide groove 65.

Each of these guide grooves extends parallel to the photographing optical axis of the camera.

The guide protrusion 66A of the finder variable magnification lens frame 66 supporting the finder variable magnification lens group L5 is fitted in the variable magnification lens guide groove 63.

The guide protrusion 67a of the refraction prism operating plate 67 is slidably positioned or fitted in the refraction prism guide groove 64; the guide protrusion 68a of the stroboscopic assembly case 68 to which the concave reflector 59 is attached. ) Is fitted into the strobe guide groove (65).

The variable magnification lens frame 66, the refractive prism operating plate 67, and the stroboscopic assembly case 68 move together along each guide groove in a direction parallel to the optical axis.

The guide protrusions 66a, 67a, and 68a have driven pins 69, 70, and 71 fitted into the variable magnification cam groove 55, the parallax correction cam groove 56, and the strobe cam groove 57, respectively.

The sections of the variable magnification cam groove 55, the parallax correction cam groove 56, and the strobe cam groove 57 correspond to the sections of the zoom operation cam grooves 20 and 21 of the cam ring 14 shown in FIG.

Specifically, the variable magnification cam groove 55 includes a wide-angle end fixed section 55a, a variable magnification section 55b, and a telephoto end fixed section 55c. Each of the three sections has an angle θ and θ. , And θ) coincide with similar angles in the cam ring of FIG.

The parallax correction cam groove 56 includes a non-projection section 56a, a projecting movement section 56, that is, a forward transfer section used in the macro mode, and a projecting position fixing section 56c, that is, a macro-step fixing section.

The strobe cam groove 57 includes a wide-angle end fixed section 57a, a variable magnification section 57b, a telephoto end fixed section 57c, a macro feed section 57d, and a macro end fixed section 57e.

The relationship between the cam grooves 55, 56 and 57 and the zoom actuating cam grooves 20 and 21 is best shown in the schematic or plan view of FIG. 44.

Since the variable magnification lens frame 66 supporting the variable magnification lens group L5 is supported to be movable along the guide surface 54a of the finder block 54, the frame 66 is best shown in FIG. As it is hanging from it.

The frame may, for example, be formed of a resin that can slide substantially without friction with respect to the finder block.

When the variable magnification lens frame 66 moves along the variable magnification cam groove 55, the magnification of the finder optical system including the lens group L3, the eyepiece group L4, and the variable magnification lens group L5 is The photographing range over the range in which the lens barrel block 1 moves varies so as to substantially match the field of view of the finder.

Refractive prism operating plate 67 is shown in FIGS. 26-28, which is described in more detail below.

The refractive prism P1 formed of synthetic resin is rotatably supported by the finder block 54 through two opposing prism support pins 74 at the bottom of the prism. These support pins include torsion springs 75 surrounding them, one end of each spring being supported by a respective position regulating piece 76 provided along the sides of the refraction prism P1, so that the refraction prism ( P1 is continuously pressed to the position where the prism P1 moves to align with the optical axes of the finder lenses L3 to L5 in a straight line. The positioning piece 76 is located in the arcuate grooves 79 formed in the finder block 54 as best shown in FIGS. 26 to 28.

The refractive prism operating plate 67 is connected to the finder block 54 and the finder block so that the guide pin 81 positioned on the side of the finder block 54 fits in the linear guide groove 82 of the guide plate 80. It is hold | maintained between the guide plates 80 (refer FIG. 25).

Positioning pieces 76 on the prism are constrained by the pivot stopping piece 77 and the guide piece 78 of the refractive prism actuating plate 67; 67 may come into contact with the end face of the groove 79.

The refraction prism operating plate 67 is such that, when the pin 79 is located in the non-projection section 56a of the parallax correction cam groove 56, the pivot support surface 77 of the plate is engaged with the position restricting piece 76. The refraction prism is retracted against the pressing of the spring 75 from the optical axis of the lenses L3 to L5 (see FIG. 26) until it is

When the pin 70 moves in the protruding movement section 56b, the guide surface 78 comes into contact with the positioning restraint 76, so that the refractive prism P1 is positioned so that it is aligned with the coaxial axis of the finder optical system. It rotates with the aid of the torsion spring 75.

During such operation, the position restricting pieces 76 move along the surface on the surface 78 and the refraction prism P1 moves into the optical path as shown in FIGS. It is refracted downward by prism P1 as shown by the arrow of FIG.

As a result of this operation, the subject, which would have been positioned below the finder optical axis, enters the field of view of the camera, and the parallax in the macro mode of the camera is reduced.

As described above, when the double wedge-shaped prism (Fig. 53A) is used to deflect the finder optical system downward and to the optical axis of the imaging optical system downward (rightward), the parallax is further reduced. do.

The guide block 85 is provided along the side surface of the strobe case 85 and, as shown in FIG. 30, is fitted in a straight guide groove 84 parallel to the optical axis of the camera formed in the guide plate 80. have.

Furthermore, the height adjustment pins 86 (see FIGS. 23 and 29) are provided on the upper and lower surfaces of the strobe case 68 and are designed to prevent the strobe case from falling downward. The strobe case 68 moves along the strobe cam groove 57 when the cam plate 53 moves in the lateral direction.

The variable magnification section 57b of the strobe cam groove 57 is configured to move the xenon lamp 58 rearward away from the Fresnel lens L6.

The rearward movement of the xenon lamp 58 reduces the irradiation angle of the light beam emitted from the Fresnel lens L6, thereby reducing the focal length and increasing the guide number as the focal length increases.

On the contrary, in the macro conveyance section 57d, the irradiation angle is increased, and thus the guide number is decreased in the macro mode.

[E. Barrier, that is, lens cap device]

The barrier lens device is best shown in FIGS. 6, 8 and 31-34.

The barrier device 30 opens and closes the pair of barriers 31 (see FIG. 8), and they are located in front of the front lens group L1 of the photographing (zoom operation) lens system, and the lens is contracted and folded. Alternatively, the cam ring 14 is closed with the aid of the rotational force generated when the cam ring 14 rotates in the cam section 20b (see FIG. 7).

31 and 32 show a first embodiment of the barrier device. In this embodiment, the barrier device 30 opens and closes the photographing opening portion 22b at the opening of the frame 22 through the pivoting barrier members 31.

The barrier members are pivotally symmetrically with respect to the photographing opening portion 22b of the front lens group support frame 22 through the pins 32.

The barriers 31 are arranged in symmetrically opposite positions with respect to each other and can be moved to protrude into the path of the photographing optical axis, respectively, and to the opposite sides of the barriers on the side where the barrier plate portions 31a are located. Drive arm portions 31b which are positioned.

The drive arm portions 31b are generally attached to the inner front surface of the barrier assembly by pins 33.

The drive arm portions 31b include pins 33 engaged by the actuating arms 34a of the opening and closing springs 34 as shown in FIGS. 31 and 32.

In other words, the pins 33 are adapted to slide in or thereby move in the fork-shaped end of each of the drive arms.

The opening / closing springs 34 are formed by, for example, a synthetic resin, and are added to the fork-type working arm portion 34a that engages the pins 33 to form a Y-shaped spring arm 34b and a driving arm portion. And 34c.

Each spring is pivoted about the barrier device 30 by a respective pin 35.

The spring arms 34b move the front lens group support frame 22 through the operating arm 34a to continuously press the barrier plate portions 31a so that the barrier plate portions 31a are separated from the light side of the photographing optical assembly. , The front opening 22b of the frame 22 is pushed to the position where it remains in the open position.

The drive arms 34c are engaged with the opposing flanges 36A of the pins 36 which are radially movable in the front lens group support frame 22.

31 and 32, the pin 36 is supported by the free lens group support frame by the free end of the operating lever 38 pivoted about the front fixing plate 13 via the pin 37. It is engaged through the automatic hole 39 of 22.

Although the pivotable actuating lever is shown in the embodiments of FIGS. 31 to 34, any structure can be used as long as the pin 36 can be moved radially inward.

The pin 36 occupies the radially projecting position by elasticity when no external force is applied to the pin 36 as shown in FIG.

In this position, the barrier plate portions 31a are located far from the photographing optical axis, and the holes 22b remain in the open position.

A positioning piece or protrusion 40 is provided on the inner wall of the cam ring 14, which is to radially press the pin 36 inward as the cam ring rotates from its fixed axial position to a predetermined position. It is adapted to press the outer end of the actuating lever (or other similar structure): this occurs when the cam ring 14 (pin 17) rotates in the opening and closing section 20a of the zooming cam groove 20.

Using the structure of such a barrier device, when the projection 40 is not engaged with the actuating lever 38, the barrier plates 31a of the barrier plates 31a of the barriers 31 open the imaging opening 22b. . Specifically, the cam ring 14 causes the rollers or pins 17 to engage with other groove sections other than the opening / closing section 20a of the zoom actuating cam groove 20, thus opening the barriers 31.

On the contrary, the zooming motor 5 moves the cam ring 14 so that the roller 17 moves from the lens storage or retracting section 20b to the opening / closing section 20a of the zooming cam groove 20 to engage the portion. When driven by a lock switch (not shown in the figure) to rotate the protrusion 40, the opening and closing pin 36 is pushed radially through the operation lever 38, and the barriers 31 are the barrier plate portion 31a. ) Rotate through engagement with spring drive arms 34c and actuating arms 34a to move them into the optical path of the lens system.

As a result, the photographing opening portion 22b is closed to protect the front lens group L1. That is, the front lens group support frame 22 closes the barriers 31 after the frame is received at the rearmost position where the picture can be taken.

When the picture is taken, the cam ring 14 is rotated so that the zooming cam groove 20 is rotated toward the position where the lens storage section 20b is engaged at the position where the opening / closing section 20a is engaged by the roller 17 (s). The zoom motor 5 is reversed to rotate.

As shown in FIGS. 33 and 34, this barrier device 30 is basically the same as the embodiment shown in FIGS.

Specifically, the barrier devices of FIGS. 33 and 34 also include a pair of barriers 31 and 31 which are positioned substantially symmetrically with respect to the imaging opening of the front lens group support frame 22. FIG.

The barriers 31 and 31 are pivoted relative to the frame 22 through the pins 32 to open and close the imaging opening 22b.

However, the detailed structure of the barrier device of this embodiment is different from that of the first embodiment.

The barriers 31 and 31 shown in FIGS. 33 and 34 are arranged symmetrically with respect to each other, and the barrier plate portions 31a and the barrier plate portions 31a which can protrude on the photographing optical axis are arranged. Drive arms 31b disposed on opposite sides.

The barriers are pivotally attached to the frame by pins 32.

The drive arms 31b include actuating pins 133 engaged with and in contact with the disconnection spring 134 having the elastic support portions 134a.

The free end of each of the elastic holding portions 134a has a respective pin so that the barrier plate portion 31a is continuously pressed to an open position in which the photographing opening portion 22b is open and the barriers are located far from the optical axis and the opening. 133).

Thus, when no external force is applied to the barriers at all, they keep the imaging opening in the open position at all times.

The sun spring 134 is made of metal and has a central U-shaped portion 134b for pressing the support pin 135 provided on the front lens group support frame 22. The sun spring 134 maintains a constant spring force in which the spring force does not change with changes in temperature, humidity or other surrounding factors.

Therefore, as a result, it is possible to press the barriers 31 in the direction in which the imaging hole is held in the open position by a substantially constant spring force.

The actuating pins 133 are engaged by the driving free pins 136a of each of the pair of left and right drive arms 136, the arms being spaced apart from each other, and the pressing force exerted by the sun spring 134. The barriers 31 are opened by overcoming this.

The free ends 136a of the respective drive arms 136 press each inside of each actuating pin 133, which is located far from the outside of the angular pin pressed by one elastic support 134a. .

The drive arms 136 are pivoted about the lens support frame 22 through the pins 137.

The drive arms include actuating arm portions 136b located on opposing sides of the drive arms from the free ends 136a and pins 137 provided therebetween to pivot the arms relative to the frame. Thus, the actuating arm portions 136b engage the flange portions 138a of the pin 138 that are radially movably fitted in the openings 39 of the frame 22.

The pin 138 includes a head (not shown) adapted to press the free end of the actuating lever 141: the lever is pivoted about the front fixing plate 13 by the pin 140: the head is pushed down When it does, it can extend through the opening 39 of the frame 22. The opening and closing pin 138 is maintained at a position protruding outward from the inner circumference of the frame 22 in the normal state, while the head of the pin 138 overcomes the influence of the sun spring 134 by the lever 141, The radial movement is possible to the position pressed inwardly through the opening 39.

Thus, when an external force acts on the pin 138, it moves radially inwards against the force of the spring 134 as shown in FIG. 34.

As in the first embodiment, when the cam ring 14 is rotated such that the roller 17 is positioned in the opening / closing section 20a of the zooming cam groove 20, the operating lever 14 (the pin flanges 138a) It is pushed inward to engage the operating arm portions 136a, and the cam ring 14 has a narrow protrusion attached to the inner periphery of the cam ring along its inner wall.

Other suitable operating structures may be used.

Using the barrier device of such a structure, the barriers 31 open the imaging hole when the position limiting piece) or the projection 40 does not engage the operating lever 141. Specifically, the barrier 31 They are opened when the roller 17 is located in a zoom operation cam groove section other than the opening and closing groove section 20a. On the contrary, after the roller 17 is positioned in the lens receiving section 20b of the zooming cam groove 20 (through the rotational operation of the cam ring 14 operated by the zooming motor 5), it is opened and closed. When moved to engage the section 20a, the protrusion 40 is opened and closed via an actuating lever 141 to rotate the barriers 31 through the driving arms 136 and the actuating pins 133. ) Is pushed radially inward, the barrier plate portions 31a enter the optical path of the lens system.

In this condition, the photographing opening is closed to protect the front lens group L1. That is, after the front lens group support frame 22 is folded from the rearmost position, that is, from the wide-angle end position at which the photograph can be taken, The imaging hole is closed by the barriers 31.

When the picture is taken, the zooming motor 5 cams from the position where the opening / closing section 20a is engaged by the roller 17 to the position where the lens storing section 20b is engaged, in order to open the barriers 31. Since it is reversed to rotate 14, the front lens group L1 moves into a position where a picture can be taken.

[F. Shading Device and Apparatus]

Light blocking devices are best shown in FIGS. 6 and 35-38. In the lens shutter type camera as mentioned herein, the front and rear lens groups can be moved independently along the photographing optical axis to achieve the zoom operation of the lens.

There is a gap between the front lens group frame 16 and the rear lens group frame 18, and the cam ring 14 includes cam grooves 20 and 21 for activating the movement of the lens frames 16 and 18. Is located on the outer periphery of the lens frames, there is a possibility that undesirable rays enter the imaging optical system through the cam grooves 20 and 21 and the gap between the front and rear lens group frames.

Furthermore, since the front lens group frame 22 moves through the opening 201 (see FIG. 6) of the front lid 200, the light rays can also enter the camera through the opening 201.

The front cover 200 covers the bottom surface of the lens barrel block 1 and supports the strobe block 2 and the lenses L3 and L6 of the finder.

The opening 201 is an inner side 202 of the front cover 200 so that the movable exterior frame 22 including the front lens group frame 16 can move through the opening 201 when the camera is in a zooming operation. It is formed along.

An annular space 203 having a relatively small width W is provided between the inner flange 202 and the front fixing plate 13.

In order to block the light rays entering the camera as described above, a light shielding device is provided.

Specifically, the light shielding device 210, which is composed of a plurality of parts, is provided on the outer circumference of the cam ring 14, and the cam grooves 20 and 21 are blocked in order to block light rays coming into the lens barrel block 1. It is to be completely or continuously covered. In the embodiment shown in FIG. 35, the light shielding device 210 includes a gearing 15, a flexible code plate 90 adjacent to the gear member 15 along one side of the gear member, and a gear member 15. It consists of a light shielding tape 211 extending on the opposite side of the.

In other words, the ring-shaped gear member encloses the flexible cord plate 90 surrounding the lens barrel block 1 on the cam grooves 20 and 21, and also the flexible and lens barrel block 1 so as to surround the cam groove ( It is located between the light-shielding tape 211 covering the 20 and 21.

The code plate 90 detects the angular position of the cam ring 14 so that the change in the focal length of the zoom lens, the change in the F number according to the change in the focal length of the zoom lens, the wide-angle end position of the zoom lens, the telephoto end position of the zoom lens, the zoom lens In order to achieve various controls which will be described in detail below with respect to the storing position, the apparatus for automatically detecting the macro-end position of the zoom lens, that is, the apparatus for detecting the position of the zoom lens, and the apparatus for reading information relating to the position of the zoom lens. It is provided.

The cord plate 90 is formed of a flexible material having light blocking properties. The light shielding tape 211 is also composed of a flexible material having such a property, for example, a dull-finish black paper.

The cord plate and the shading (paper) tape are attached to the cylindrical outer surface of the cam ring 14 along the opposite side of the gear member 15 to cover the main portions of the zoom actuating cam grooves 20 and 21.

The gear 15 is superimposed or superimposed on the side of the code plate and the light shielding tape as shown in FIG. 6 to ensure light blocking.

The ring-shaped shading member 220 forming an additional part of the shading device is the front fixing plate 13 and the front cover 200 which rotatably support the front part of the cam ring 14 as best seen in FIG. It is provided in the annular space 203 formed by the space between them.

The ring-shaped light shielding member 220 located in the ring-shaped space 203 is composed of a ring-shaped elastic body 221 such as rubber and a ring-shaped reinforcing plate 222. It is in the form of a substantially flat annular ring, as best shown in FIGS. 36 and 37.

Since the thickness W of the light blocking member 220 is slightly smaller than the width W of the annular space 203, the light blocking member 220 can move by a distance along the direction of the photographing light side in the space 203. Can be.

The elastic body 221 of the light blocking member 220 has a light shielding lip having a small width along which its circumference is in sliding contact with the outer circumference of the outer frame 220.

The reinforcement plate 222 may be fixed to the elastic body 221. For example, the elastic body 221 may be partially embedded in the connection recesses, holes, or openings 224 formed in the reinforcing plate 222. The reinforcement is made of metal or synthetic resin, for example.

The inner lip 223 has considerable flexibility so that it can move in any direction in the axial direction of the lens barrel block in which it is located. Thus, the lip can play a small role in reducing the rebound of the barrier block after it stops moving in the first axial direction.

FIG. 38 shows a second embodiment of the annular ring shown in FIGS. 36 and 37, wherein there are two spaced apart shading ribs 223 (not just one) increasing the sunscreen effectiveness. It is formed on the inner circumference of the ring-shaped light blocking member 220 to make.

These ribs are spaced apart in parallel to each other and form a generally annular U-shaped flange, which is done inwardly with respect to the light shielding member. The elastic body 221 has such a structure that the outer periphery of the reinforcing plate 222 is formed. It is used to cover.

Optionally, it is possible to replace the annular shading member 220 with a conventional 0-ring structure, which is the simplest method of blocking incoming light into unwanted areas within the camera.

By using such a light shielding device, unnecessary rays are transmitted through the periphery of the front lens group frame 16 and / or the rear lens group frame 18 and also through the front ring-shaped opening between the lens barrel and the camera lid. Nor does it enter the camera lens system.

[G. FPC Board Guide and Anti-reflective Device]

FPC substrate guides and their associated antireflective devices are best shown in FIGS. 39-43.

In the lens shutter type camera as in the present invention, it is necessary to supply the operation signals from the body of the camera to the shutter block 23 on the lens barrel block 1. The shutter block 23 is supported by the support frame 22 of the front lens group L1 and thus moves along the direction of the fruit along with the front lens group L1.

In response to the outputs of the range finder, ie the range finder and, for example, the exposure control device on the camera body, ie the range finder and, for example, the exposure control device on the camera body, the actuation signals from the camera body. In order to send to the shutter block 23 moving in the optical axis direction, a flexible printed circuit board (hereinafter referred to as an FPC substrate) is preferably used.

An apparatus for guiding the movement of the FPC substrate and the antireflective device used in connection with the substrate is described below in more detail with reference to FIGS. 39 to 43.

The FPC substrate 160 (see FIGS. 39 and 40) supplies an operation signal to the sharp jute shutter block 23 of the camera body.

The substrate is made of a flexible synthetic resin sheet having a predetermined printed circuit pattern. In general, the FPC substrate is well known.

As shown in FIG. 39, the FPC substrate 160 includes a connection pattern 161 at the front end of the substrate to which the shutter block 23 is electrically connected, and a CPU provided in the camera body (shown in the drawing). The central processing unit (not shown) is provided with a rear connection pattern 162 which can be electrically connected.

The FPC board guide plate 163 for guiding the FPC board 160 is fixed to the camera body at the substrate or the rear portion of the camera body, and the lens barrel block 1 in the space between the cam ring 14 and the outer frame 22. Stretches forward.

The fixed clubs 166 are provided for attaching the FPC substrate 160 to the guide plate 163, and the fastening member 167 (see FIG. 41) is for example die-cast of the FPC substrate 160. It is provided for attachment to the front of the camera body frame or to the rear of the lens barrel frame (substrate 6).

A bend guide 165 is provided on the front end of the FPC board guide plate 163: the bend guide has a pair of front and rear guide pins 168 and 169. These guide pins are preferably It is fixed (though rollers can be used instead) to maintain the curvature of the FPC substrate 160 along the fixed bend 160a of the substrate, in which the substrate extends from the camera body and also the camera Bend forward in the opposite direction to extend towards the body.

It extends backward in the gap between the FPC board 160 and the FPC board guide plate 163 that surrounds the guide pin 168, and is freely bent forward again in the movable bend 160b.

It is apparent that the relative position between the guide pins 168 and 169 and the FPC substrate 160 is constant regardless of the forward and backward movement in the axial direction of the shutter block 23.

Thus, the guide pins 168 and 169 are preferably non-rotatable fixing pins. Alternatively, it is possible to replace these pins with guide rods or shafts so that the FPC substrate bends them in the opposite direction.

As the shutter block 23 moves in the front-rear direction, the movable bend portion 1600 of the FPC substrate also moves forward and backward.

39 and 40, although the extension of the FPC substrate 160 extends rearward from the substrate guide plate 163, the rear extension of the FPC substrate 160 is actually directed toward the front of the camera. It can be bent along and by the bending guide 170 of the guide plate 163 to move it.

The inner surface of the FPC substrate 160 faces the gap between the front lens group frame 16 (as well as the external frame 22) and the rear lens group frame 18, so that the light incident on the lens system Reflected by the FPC substrate, there is a possibility of causing undesirable internal reflection.

To prevent such internal reflection, an antireflective material or device is provided on the FPC substrate.

Several alternative solutions may be used to provide antireflection devices on the FPC substrate 160. As one solution, the FPC substrate 160 may be formed of a matt black synthetic resin material.

Alternatively, the FPC substrate 160 may include an antireflection sheet 171 along the inner surface of the substrate, that is, on the surface adjacent to the optical axis of the camera, as shown in FIG. Such a sheet may be composed of, for example, matte black paper, and is intended to be placed on the FPC substrate 160.

Preferably, the antireflective sheet 171 is only loosely superimposed on the FPC substrate 160 without being attached to the substrate to provide flexibility against deformation due to expansion and contraction of the material.

The sheet 171 is positioned on the FPC substrate between the bends 160a and 160b of the FPC substrate 160. The third solution is to coat at least the inner surface of the FPC substrate 160 with an antireflection layer.

Using the guide device of the FPC board and the above-mentioned antireflection device, when the zoom operation motor 5 is driven to rotate the cam ring 14, the front lens group frame 16 and the rear lens group frame 18 Is moved along the optical axis in the direction along the cam grooves 20 and 21 along the optical axis so that the camera can be moved to a position on the macro board.

Since the movement of the front lens group frame 16 causes the shutter block 23 to move in the same direction, the FPC substrate 160 is extended in accordance with the movement of the shutter block 23. The elongation of the substrate is made possible by the displacement of the movable flexible substrate portion 160b. Specifically, the FPC board 160 is integrally connected to the CPU in the camera body in the rear connection pattern or portion 162 (see FIG. 39), and the middle portion of the FPC board is connected by the FPC board guide board 163. You are guided.

The fixed bent portion 160a of the FPC substrate 160 is guided by being fixed by the guide pins 168 and 169, so that the tip connection pattern 161 of the FPC substrate 160 is moved to the movement of the shutter block 23. Thus, when moving in response to or in response thereto, as shown in FIGS. 40 and 42, only the movable flexure board portion 160b is displaced forward and backward to absorb the movement of the shutter block 23.

In this way, the FPC substrate 160 can be reliably guided in the ridge space 164 located between the cam ring 14 and the outer frame 22 (see FIG. 4).

Since the FPC substrate 160 has the antireflection structure as described above, no internal reflection occurs that causes undesirable phenomena, such as flare or ghosting.

[H. Zoom lens position information detection device]

As mentioned above, in the lens shutter type camera formed in accordance with the present invention, since the photographing optical system is moved along the optical axis by the rotation of the cam ring 14, the photographing optical system is rotated by the rotation of the cam ring 14. Since the focal length of the imaging optical system is changed, the optical system moves from one extreme angular position of the cam ring to the macro setting position and from the other position of the cam ring to the (complete) retracted position of the lens.

In such a lens shutter type camera including a zoom lens, for example, the focal point of the photographing optical system is used to display the focal length, control the exposure varying according to the number of F, and control the rotational direction of the motor driving the different cam ring. It is necessary to detect the distance, macro setting position, and two extreme positions of the cam ring.

In the present invention, the information, that is, the focal length and the two extreme positions of the zoom lens, can be easily detected by the code signals on the single flexible code plate 90 provided in the cam ring 14. have.

Specifically, as shown in FIG. 44, the code plate 90 is provided on the cam ring 14 (shown in FIG. 1), and is provided with a fixed frame (located outside the cam ring 14). It is in sliding contact with the brush 92 (see FIG. 44) fixed to the substrate end portion 91. As shown in FIG. This is illustrated well in FIG.

FIG. 44 shows an improved code plate 90 in an expanded state, the upper half of the figure showing the zoom actuating cam grooves 20 and 21 of the chamfer 14 and the cam grooves 55, 56 and 57 of the cam plate 53. Each of the cam phenomena is shown. Brush 92 or common terminal C and bristle terminals T0, T1, T2 and T3 are included.

Each of the terminals T0 to T3 has a signal 0 when it is electrically connected to a conductive land 93 of the code plate 90, and a signal 1 when it is not electrically connected.

The angular position of the cam ring 14 can be detected by a combination of signals 0 and 1. A plurality of dummy terminals 94 are formed in the conductive lands 93.

The purpose of the dummy terminals 94, which are formed of the same material as the conductive lands 93, is to be bent around the flexible cord plate cam ring, and the dummy terminals are provided to provide an area that is not electrically contacted while improving the strength of the plate. It is so positioned that it preserves strength while increasing flexibility.

These dummy terminals also provide (non-conductive) land portions on which the terminals T0 to T3 of the brush ride as the cam ring is rotated.

The 4-bit information received from the terminals T0 to T3 is provided as zoom code data ZP0, ZP1, ZP2, and ZP3 of the zoom code encoder, as shown in FIG. .

This figure consists of a combination table of signals 0 and 1, where the angular position of the cam ring 14, i.e., POS, is divided into steps 0, 9 and hexadecimal, A, B and C.

The number 0 represents the locked position and the C position represents the position where the camera is in macro mode.

There are nine focal length positions f0 to f7 'between the lock position and the macro position. The lock position and the macro position correspond to two extreme angular positions of the cam ring 14.

The zoom motor 5 is controlled so that the cam ring 14 does not rotate beyond the range of the two extreme positions. These angular or rotational positions are shown on the code plate of FIG.

The rotation of the cam ring 14 depends on the position information of the cam ring 14 determined by the code plate 90 by the mode switching switch 101 and the zoom switch 102 shown in FIGS. 47 to 50. Controlled.

The arrangement of the mode switching switch 101 and the zoom switch 102 on the camera body is shown in FIGS. 46-48.

A release button 99 is provided on the top surface of the camera, which can be pressed in one step to turn the metering switch to the ON position, and can be pressed in two steps to turn the release switch to the on position. (But none of these two switches are shown in the figure).

The mode switching switch 101 is a switching switch which can occupy three positions, namely, a lock position LOCK, a zoom operation position ZOOM, and a macro position MACRO.

As shown in FIG. 49 and FIG. 50, when the macro button 101a is not pressed, the switch lever 101b can move between the LOCK and ZOOM positions. However, if the switch lever 101b slides over the upper surface of the macro button 101a when the macro button 101a is pressed, the macro mode of the camera is set.

49 and 50 are cross-sectional views of the MACRO and ZOOM-LOCK switches, respectively.

When in the LOCK position, neither release nor zoom operation of the zoom lens can be performed. However, in the zoom position, the release operation and the zoom operation operation can be performed.

In the MACRO position, the release operation can be performed, but the zoom operation cannot.

Fig. 51 shows another arrangement of the zoom switch, wherein when the telephoto button T is pressed, the zoom lens is moved toward the telephoto position, and when the wide angle W is pressed, it is moved toward the wide angle position.

The zoom switch 102 is in a neutral position, that is, in an OFF position when no external force is applied to the switch. Then, it can be moved manually by the wide angle position, that is, the WIDE position, and the telephoto position, that is, the TELE position, which is located on the opposite side of the neutral OFF position.

The zoom motor 5 can be rotated in the forward and backward directions by switching the position of the zoom switch 102 between the WIDE and TELE positions.

The mode switching switch 101 and the zoom switch 102 operate the camera of the present invention as described below.

In practical use, positional information on the position of the cam ring 14 indicated by the code plate 90 is used.

1. Following the LOCK position of the mode switching switch 101, the zoom motor 5 zooms when zero is off (see FIGS. 44 and 45) as detected to rotate the Chemlang 14. The operation coater 5 stops rotating.

2. In the MACRO position of the mode switching switch 101, the zoom operation motor 5 rotates in the full load direction and stops rotation when the POS reaches the C position.

3. In the ZOOM position of the mode switching switch 101, the zoom operation motor 5 rotates in reverse when the zoom switch 102 is in the WIDE position and in the forward direction when the zoom operation switch is in the TELE position.

The zoom motor 5 stops rotating when the POS reaches the A position and the zoom switch is in the TELE position.

When the zoom switch is in the WIDE position, the zoom operation motor 5 continues the reverse rotation for a predetermined short time after reaching the POSRK 1 position.

After this time, the zooming motor 5 starts to rotate in the forward direction and stops rotating when the POS reaches two positions.

When the zoom switch 102 is turned OFF, that is, when the zoom switch is in the TELE position during the rotation of the zoom operation motor 5, the zoom operation motor 5 immediately stops rotating, and the zoom switch is WIDE. When in position, it stops after rotating forward for a predetermined short period.

Several detailed locations will now be described.

POS 1: Since the code signals change at the LOCK position and at the WIDE position, these extreme positions are detected. More precisely, the lock position is not POS 0 but instead is at a point located between POS 0 and POS 1.

However, when the camera is in the LOCK position, the brush is at POS 0, very close to POS1.

Similarly, the WIDE unit value is a point between POS1 and POS2.

However, when the camera is in the WIDE end position (it is not a wide area), the brush 92 is at POS 2 which is very close to POS1.

Accordingly, POS 1 indicates the position at which the cam ring 14 moves from the WIDE end position to the LOCK) position or vice versa.

POS f7 ': This area is provided to absorb backlash of the cam ring 14 (ie absorb the backlash of the lens system). Specifically, as shown in FIG. 45, while the chamfer 14 rotates from POS 0 to POS C, the cam ring stops immediately when a stop signal is given, that is, when the zoom switch is switched to the OFF position. On the contrary, the rotation towards POS 0 at the POS C of the cam ring causes the cam ring 14 to turn slightly back after an excessive amount of travel by a given displacement and then stops the chamber just at the first conversion POS point.

POS f7 'is at the TELE end position, and therefore, when the tamling is at the TELE end position (TELE area is the area where the cam ring operates for TELE exposure), the brush is located at position POS A, which is very close to POS 9.

The focal length information or the F number information is transmitted to the shutter by the code plate and the brush. Therefore, the same focal length information is transmitted in the TELE area and the TELE end position.

This is why POS 9 is denoted by f7 and POS A is denoted by f7 'to distinguish it from f7.

The area f7 'is very small, and therefore, the area f7' is considered to be essentially the same as the TELE end position.

POS B: Similar to POS 1, this area is provided to distinguish between the MACRO and TELE stage locations. POS 1 differs from POS 1 in that the WIDE end position changes between POS 1 and WIDE unit values, while POS B is the TELE end position indicating the point of change between POS 9 and POS A.

POS 2-POS A: These are intermediate focal lengths consisting of a plurality of nine steps in the illustrated embodiment.

So the CPU checks the code information and setting positions for several switches when they are switched to the ON position.

If the mode switching switch is in the zoom position, no zooming operation is necessary at all when the cam ring is in any position between POS 2 and POS A.

However, when the mode switch is in any position other than the zoom position, that is, the LOCK position, the intermediate position between LOCK and WIDE, the intermediate position between TELE and MACRO, or the MACRO position, the zooming operation of the lens is performed immediately.

This also applies when the switch is in the zoom position while the zoom motor is rotating in the forward direction and when the switch is in the zoom position while the zoom motor is in reverse rotation.

Specifically, when in the zoom position, the CPU checks whether the zoom code is within the area between the area including POS 2 and POS A (in the area where the zoom operation is performed). If the zoom code is outside that area, no picture can be taken, and therefore, the cam ring is moved to the zoom operation position.

In other words, POS 1 and POS B are areas where the cam ring is prohibited from stopping and cannot be photographed.

Of course, the present invention is not limited to the above-described embodiments nor limited to those shown in the drawings, and various modifications or changes may be made without departing from the spirit and scope of the claimed invention. will be.

Claims (4)

A light shielding device of a lens shutter type camera comprising a rotatable cam ring having at least one cam groove, the light shielding device comprising: a flexible code plate at least partially fixed to an outer circumference of the cam ring and surrounding an outer circumference of the cam ring; And a ring-shaped gear fixed around the outer circumference of the cam ring and an annular gear fixed around the outer circumference of the chamber ring, wherein the gear is located between the code plate and the light shielding tape, and a photographing lens is located inside the cam ring. And the light shielding device constitutes a means for covering each cam groove to prevent light rays from entering the cam ring. The light shielding device of claim 1, wherein the cam ring includes a plurality of grooves. A cam ring mounted to the rotatable support member at a predetermined axial position, at least one movable lens barrel movable along the optical axis of the photographing optical system of the camera in association with the rotation of the cam ring, and the front end of the cam ring support member and the lens barrel And a light shielding member positioned in a space of a front lid strabische having an opening therethrough, wherein the light shielding member has an annular shape, is not fixed to any member, and remains in a floating state, and the annular light shielding member is positioned. The space is also annular, the lens shutter camera, characterized in that the inner circumference of the light blocking member includes a flexible lip in sliding contact with the outer circumference of the lens barrel. According to claim 3, wherein the annular reinforcing plate is located on the outer periphery of the annular light shielding member, wherein the annular light shielding member is made of an elastic body and the reinforcing plate is made of metal or plastic that is more rigid than the annular member. Camera.