JPH0610716B2 - camera - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a camera with a variable focal length.

[Background of the Invention]

Generally, in a camera equipped with a flash device, if the distance between the light emitting part of the flash device and the window for the shooting lens is narrow, a red-eye phenomenon occurs during flash shooting (the light emitted from the flash device is specularly reflected by the retina of the human eye, which is the subject). However, it is known that the reflected light is exposed on the film through the taking lens, and as a result, the human eye shown in the finished photograph becomes eerily reddish). . This phenomenon is more likely to occur as the amount of light emitted from the flash device increases and as the focal length of the taking lens increases (that is, the taking magnification increases).

Therefore, in a small camera such as a compact camera with a flash device in which the distance between the flash device light emitting section and the window for the photographing lens is narrow, it has been conventionally avoided to equip the long focus lens, but recently, the performance of the compact camera has been improved. In response to the demands of consumers for improved performance and expanded applications, a dual-focus switchable compact camera with a flash device equipped with a long-focus lens capable of telephoto shooting in addition to the conventional short-focus lens is being commercialized. As a result, the red-eye phenomenon in such a compact camera becomes a problem.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and includes a first photographing optical path system, a first entrance window for making photographing light incident on the first photographing optical path system, and a first photographing optical path system. A second photographing optical path system having a long focal length, a second incident window for making photographing light incident on the second photographing optical path system, and a distance from the second incident window from the first incident window. An object of the present invention is to provide a camera having a flash light emitting unit set at a position farther than the distance and capable of changing the focal length, which is capable of achieving both miniaturization and mitigation of the red-eye phenomenon during flash photography.

Example of Invention

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

FIGS. 1 to 3 show three states of the camera of the embodiment of the present invention, and FIG. 1 (a), FIG. 2 (a) and FIG. FIG. 1 (b), FIG. 2 (b) and FIG. 3 are perspective views of the front surface of the camera at the time of shooting, when shooting with the short focus lens and when shooting with the long focus lens.
(b) is Fig. 1 (a), Fig. 2 (a), and Fig. 3 respectively.
Schematic cross-sectional plan view of the main part of the camera in each state of (a),
1 (c), 2 (c) and 3 (c) are shown in FIG. 1 (b).
2B and FIG. 3B are diagrams showing a state of a main part of the camera viewed in a direction of arrows CC.

In FIGS. 1 (a) to 1 (c), reference numeral 1 denotes a camera body, and the camera body 1 has a spool chamber 1a for accommodating a film take-up spool 5, a cartridge chamber 1b for loading a cartridge 6 therein, An aperture 1c for exposing the film F to the subject light, a battery chamber 1d for accommodating the battery,
Is provided. Reference numeral 2 denotes a slide cover which can be slid rightward in FIG. 1. The slide cover 2 is slidably fitted to the camera body 1, and a finder eyepiece hole 2a is provided on the back surface thereof. As shown in FIG. 1 (c), a pin 2b is projectingly provided on the inner wall surface, and a photographic lens opening 2c is further provided on the front surface. A protective plate 3 having a strobe protector 3a, a finder window 3b, an AF (for automatic focus adjustment) projecting window 3c, and an AF receiving window 3d is bonded to the front surface of the slide cover 2. The protective plate 3 is printed on a transparent acrylic resin plate.

The front side of the slide cover 2 has an opening 2c for the photographing lens.
Is provided with a protective plate 4 (barrier) fitted to the slide levers 27 and 2 shown in FIG. 1 (c).
It can move to the left and right in FIG. 1 (c) integrally with 8, and is connected to the slide lever 27 via a pin 4a protruding on the back surface of the protective plate 4 and also protruding on the back surface. The pin 4b is also connected to the slide lever 28 by fitting in the vertical slot 28e of the slide lever 28. The width of the protective plate 4 is shown in FIG.
Although it is designed to be larger than the movement amount of the slide cover 2 in the process from (a) to the state of FIG. 3 (a),
This is to prevent the internal mechanism of the camera (particularly the portion shown in FIG. 4) from being exposed when the slide cover 2 is moved as shown in FIG. 3 (a).

Reference numeral 7 denotes a back lid, and a base end of the back lid 7 is pivotally attached to the camera body 1 by a pin 7a, and a tip of the back lid is attached to a part of a wall surface of the cartridge chamber 1b by a back lid claw not shown. It is locked. Reference numeral 8 denotes a front decorative plate arranged inside the front surface of the slide cover 2, and has a long-focal-lens opening 8a and a short-focal-lens opening 8b penetrating therethrough. I am configuring. Reference numeral 9 denotes a back face decorative plate, which is provided with a notch 9a for the finder, and serves as a stationary member together with the camera body 1. The front decorative plate 8 and the rear decorative plate 9 protect the lens system and mechanism inside the camera from being exposed to the outside when the slide cover 2 is slid rightward from the state shown in FIG. 1 for photographing. is doing.

As shown in FIGS. 2 (a) and 3 (a), a release button 41 is provided on the main body immediately above the spool chamber 1a, which is hidden under the slide cover 2 when not photographing. There is.

Reference numeral 10 denotes an AF light receiving lens, which is an AF light receiving window 3d on the front of the camera.
And is supported by the frame 11. A light receiving element 12 such as a PSD is arranged behind the AF light receiving lens 10, and infrared light projected from the light projecting window 3c is reflected by the object surface and enters from the lens 10 to form an image on the light receiving element 12. It has become so.

Reference numerals 13 to 16 are finder lens groups. The finder lens group includes an eyepiece lens 13 having a field frame formed by metal deposition on the front surface, a frame reflection lens 14 having a half mirror formed on the rear surface, and a short focus lens. The objective lens 15 and the long focus objective lens 16 are included. The short focus objective lens 15 is fixed on a switching lever 17 which can rotate about an axis 17a, but the long focus objective lens 16 is mounted on the switching lever 17 so as to be rotatable about an axis 16a. It is also urged clockwise by a spring (not shown) about the shaft 16a. In the non-photographing state shown in FIG. 1 (c) (that is, the slide cover 2 is not moved with respect to the main body 1), the surface of the long focus objective lens 16 contacts the side wall surface of the slide cover 2. The lens 16 is prevented from rotating in contact therewith.

The switching lever 17 is urged clockwise by a spring (not shown) around the shaft 17a in FIG. 1 (b), but in the state shown in FIG. 1 (b), it is provided on the camera body 1. A part of the lever 17 is in contact with a cam (not shown), and the rotation of the lever 17 is suppressed by the cam.
(Therefore, when the slide cover 2 is pulled away from the camera body 1, the engagement between the cam and the lever 17 is gradually released, and the lever 17 rotates clockwise about the shaft 17a. 18 is a taking lens composed of several lenses, and the lens is a pendulum type lens as shown in FIGS. 1 (c) to 3 (c) and 4. It is attached to the holding frame 19. The position of the lens holding frame 19 shown in FIG. 1 (c) and FIG. 2 (c) is when the camera of the present invention is not photographing (FIG. 1) and when photographing with a short focus lens (FIG. 2). It is the position at and.

Reference numeral 20 denotes a movable mirror, which is fixed to a mirror holding frame 21 that is rotatable around a shaft 21a. Movable mirror 2
0 has a reflecting surface on the left side in FIG. 1 (b), and it is a mirror surface as shown in FIG. 1 (b) and FIG. 2 (b) when not shooting and when shooting with a short focus lens. Is automatically positioned so that is substantially parallel to the front-back direction of the camera. Rotational force is applied to the mirror holding frame 21 counterclockwise about the shaft 21a in the state shown in FIG. 2 (b) by a toggle spring (not shown), while it is turned clockwise in the state shown in FIG. 3 (b). Rotational force is applied. The shaft 21a of the mirror holding frame 21 is rotatably supported by a bearing portion provided on a structural member (not shown).

Reference numeral 22 is a light-shielding wall, and 23 is a shutter which is arranged behind the taking lens 18 and in front of the aperture 1c and which also serves as diaphragm blades.

Reference numeral 24 is a fixed reflection mirror for forming a Z optical system for long-focus shooting, 25 is a converter lens that also forms an optical system for long-focus shooting, and 26 is a shutter that also serves as diaphragm blades for long-focus shooting. . A fixed position of the converter lens 25 can be adjusted in the front-rear direction by an unillustrated front-rear direction adjusting mechanism, and together with a screw 40 described later for adjusting the front-rear direction position of the lens holding frame 19, a focus at the time of long-focus photography. It can be adjusted.

Reference numerals 27 and 28 denote slide levers connected to the protective plate 4 (barrier) via pins 4a and 4b, and the slide levers 27 and 28 are provided with long grooves 27a and 2 thereof.
It is supported on the structural member by pins 29 and 30 of the structural member fitted to 8a, and is biased leftward in FIG. 1 (c) by springs 31 and 32. The slide levers 27 and 28 have arms 27b and 28b connected to the projecting pins 4a and 4b of the protective plate 4 as described above.
Besides, the arms 27c and 28c that engage with the protruding pin 2b of the slide cover 2, the arms 27d and 28d that engage with a pin (not shown) provided on the mirror holding frame 21, and the engaging element 19d of the lens holding frame 19 are engaged. Arms 27e that fit together are provided. The operation of these parts and the operation of the optical path system of the camera will be described later.

FIG. 4 is a perspective view showing the lens holding frame 19 and a structural portion related to the lens holding frame 19, and FIG. 4 (a) is FIG. 1 (c) and FIG.
Shows the posture of the lens holding frame in the state shown in (c),
FIG. 4B shows the posture of the lens holding frame in the state shown in FIG. 3C (that is, at the time of long-focus shooting).

The lens holding frame 19 has a pendulum shape, and a shaft 19a serving as a rotation center thereof is rotatably and axially movably supported by bearing portions of the structural members 33 and 34, and the shaft 19a is also provided.
In FIG. 4 (a), it is urged forward by an axial force by a spring 35 fitted in the. The tip of the shaft 19a is configured as a spherical cam follower 19b,
The cam follower 19b is a cam surface 36 of the cylindrical end surface cam 36.
It is pressed against c by the force of the spring 35. End face cam 3
The gear 6 can rotate about an axis parallel to the shaft 19a by an integrated gear 36b. Gear 36
b has a hole 36a at its center.
It is rotatably supported by the shaft-like portion of the structural member inserted in 6a, and is rotationally driven by an AF driving device (not shown) via a gear 39 meshing with the gear 36b. A screw 40 is mounted on the front surface of the gear 36b so as to move in the front-rear direction when rotated with respect to a structural member (not shown). Can be moved in the axial direction in the figure, and as a result,
At a certain rotation phase of the end face cam 36, the lens holding frame 19
The axial position of can be changed minutely. Such an operation means finely adjusting the lens holding frame 19 along the axial direction of the lens, that is, the focus of the lens 18 can be adjusted by the screw 40. In addition, the axis of the screw 40 is at a position matching the axis of the shaft 19a,
Therefore, even when the screw 40 is rotated, the pressure contact between the cam surface 36c and the cam follower 19b is on the axis of the screw 40, so that there is no risk of the cam 36 tilting.

The lens holding frame 19 is provided with an engaging element 19d provided at the tip of its arm 19e and a projection 19c provided at its opposite end, and is biased by a spring (not shown) in the clockwise direction around the shaft 19a. As shown in FIGS. 1 (c) and 2 (c), the engaging element 19d engages with the arm 27e of the slide lever 27 at the time of non-shooting and at the time of short-focus shooting, and the projection 19c is also the same. As shown in FIGS. 1 (c) and 2 (c), the lens holding frame 19 is positioned at a predetermined first position by contacting the stopper 37 of the structural member during non-photographing and short-focus photographing. At the same time, during long-focus photography, as shown in FIG. 3 (c), it abuts on another stopper 38 of the structural member to position the lens holding frame 19 at a predetermined second position.

Next, the operation of each part of the camera having the above structure will be described.

During non-shooting and storage, the slide cover 2 is abutted to the battery chamber 1d side up to the position where the release button 41 is hidden, as shown in FIG. While being shielded by the (barrier), the viewfinder eyepiece hole 2a is closed by the rear decorative plate 9 as shown in FIG. 1 (b). The main part inside the camera is in the state shown in FIGS. 1 (b) and 1 (c).

When performing short-focus photography, pull out the slide cover 2 to the right from the state shown in FIG. 1 (a), and if the slide cover 2 stops at the first position where a click stop is applied, the state shown in FIG. 2 (a) is obtained. When the photographing lens opening 2c appears, the AF light-projecting window 3c and the AF light-receiving window 3d closer to the strobe protector 3a are opened, and as shown in FIG. 2 (b), the viewfinder eyepiece hole 2c is opened and the shutter is released. The button 41 is exposed so that short-focus photography is possible.

There is almost no change in the internal mechanism of the camera in the process of shifting from the state of FIG. 1 to the state of FIG. 2, but as shown in FIG. 2 (c), the pin 2b integral with the slide cover 2 is 1
It is moved to the right of the state shown in the drawing, and the taking lens opening 2c of the slide cover 2 and the short focus lens opening 8b of the front face plate 8 are aligned with the taking lens 18.

When the release button 41 is pressed in this state, the AF projection window 3
The light projected from c toward the subject is reflected by the subject, enters the AF light receiving window 3d, and is placed behind the window 3d.
An image is formed on the light receiving element 12 through the F light receiving lens 10, converted into an electrical signal by the light receiving element 12, and then the distance of the subject is calculated by an arithmetic processing unit mounted in the camera. As a result, when the distance to the subject is calculated, the gear 36b is moved by the drive device (actuator) (not shown) via the gear 39 in FIGS. 4 (a) and 4 (b) based on a command from the arithmetic unit. The end face cam 36 that is rotated and is integral with the gear 36b is also rotated. Therefore, the contact position of the cam follower 19b, which is in contact with the cam surface 36c, with the cam surface changes along the axial direction of the shaft 19a, so that the taking lens 18 becomes the film F of the taking lens aperture 1c. On the other hand, the subject is positioned in the front-rear direction and the subject is automatically focused. In this case, the posture of the lens holding frame 19 is shown in FIG.
It becomes what was shown in (c) and FIG. 4 (a).

Next, the shutter 23 is opened and the subject light is emitted from the photographing lens 18.
To reach the aperture 1c and form an image on the film F in the aperture 1c to expose the film F, whereby the photographing at the short focus is completed. In this case, the optical path for viewing the subject through the viewfinder eyepiece hole 2a is shown in FIG. 2 (b).
As shown in, the eyepiece lens 13 and the frame reflection lens 14
And an objective lens 15 for short focus.

In the above case, even if flash photography is performed, the red-eye phenomenon hardly occurs because the focal length of the taking lens is short. On the other hand, when performing long-focus photography (that is, telephoto photography), if the slide cover 2 is pulled out further to the right from the position shown in FIG. 2 (a), when the click stop is applied at the position shown in FIG. 3 (a). Stop. In this state, as shown in FIG. 3 (a), the long focus lens opening 8a at a position distant from the strobe protector 3a opens, and the AF projecting window 3c and the AF light receiving window 3d at a position distant from the strobe protector 3a also open. The AF unit fixed to the main body is located, and the respective parts inside the camera have the relative positional relationship shown in FIGS. 3 (b) and 3 (c).

The operation of each part when the state shown in FIG. 2 (b) and FIG. 2 (c) changes to the state shown in FIG. 3 (b) and FIG. 3 (c) is described below. This will be described with reference to FIGS.

When the slide cover 2 is moved to the right in the state shown in FIG. 2 (c), the pin 2b integral with the slide cover 2 is formed.
To the right to engage the respective arms 27c and 28c of the slide levers 27 and 28, and then move the slide levers 27 and 28 to the right against the tension of the springs 31 and 32. Therefore, the protective cover 4 connected to the slide levers 27 and 28 via the pins 4a and 4b.
Together with the slide lever (ie slide cover 2
(Together with) and move to the right to block the short focus lens opening 8b of the front decorative plate 8. On the other hand, as the slide levers 27 and 28 move to the right, the engagement between the arm 27e and the engaging element 19d of the lens holding frame 19 is released.
The torque that urges the lens 19 in the counterclockwise direction about its axis 19a disappears, and as a result, the lens holding frame 19 rotates clockwise about the axis 19a by the force of the spring (not shown). Then, when the slide lever 27 further moves to the right and the movement of the slide cover 2 is click-stopped, as shown in FIG. 3 (c), the lens holding frame 1
The protrusions 19c of 9 are brought into contact with the stopper 38 of the structural member. As a result, the lens holding frame 19 is shown in FIG. 3 (b).
As shown in FIG. 4 (b) and FIG. 3 (c), they are positioned on the axis line that coincides with the optical axis of the converter lens 25 for long focus photography.

On the other hand, the arms 27d and 28d of the slide levers 27 and 28 are not shown on the mirror holding frame 21 in the process of moving the slide levers 27 and 28 from the position of FIG. 2 (c) to the position of FIG. 3 (c). Engage the parts, said arms 27d and 28
When the mirror holding frame 21 is moved to the axis 2 by the rightward movement of d.
It is rotated clockwise in FIG. 2 (b) about 1a to be converted into the state shown in FIG. 3 (b) and FIG. 3 (c).
As a result, the subject light that has entered through the long focus lens opening 8a reaches the aperture 1c through the Z-shaped optical paths of the photographing lens 18, the shutter 26, the converter lens 25, the fixed reflection mirror 24, and the movable mirror 20. .

In addition to the optical system associated with the taking lens as described above, the optical system associated with the finder is also converted as follows during long-focus photography.

That is, from the state shown in FIG. 2 (b), the slide cover 2
Is moved to the right, it engages with a cam (not shown) formed on the camera body 1 and, in FIG. 2 (b), the shaft 17a is engaged.
Switching lever 17 is urged clockwise around
Is gradually disengaged from the cam as the slide cover 2 moves to the right, so that the slide cover 2 rotates clockwise about the shaft 17a to move the slide cover 2 to the position shown in FIG. 3 (b). When this is done, the switching lever 17 is rotated to the position shown in FIG. 3 (b).

On the other hand, the long-focus objective lens 16 biased clockwise by the spring (not shown) about the axis 16a is shown in FIG.
In the state of (b), rotation is prevented by the side wall surface of the slide cover 2, but the slide cover 2 is shown in FIG.
Since the engagement with the slide cover 2 gradually disengages as it moves from the position (b) to the right, when the slide cover 2 reaches the position shown in FIG. 3 (b), the long-focus objective lens 16 moves to the third position. As shown in Figure (b), the shaft 16a is moved clockwise to a position rotated about 90 °.

Therefore, the optical path of Fiinder during long-focus photography is shown in Fig. 3 (b).
As shown in, the eyepiece lens 13 and the frame reflection lens 1
4 and the long focal length objective lens 16 are combined.

As described above, the shooting operation after the optical system of the taking lens 18 and the optical system of the viewfinder are set for long-focus shooting (that is, the automatic focusing operation after pressing the release button 41, etc.) Since it is as described above, the description is omitted.

As described above, the strobe protector 3a is used for long-focus photography.
Since the subject light is incident on the aperture 8a for the photographing lens at a position sufficiently away from, the camera of the present invention is less likely to cause the red-eye phenomenon even during long-focus flash photography, and a high-quality image can be obtained. In addition, since the photographing lens also moves away from the flash emission part during long-focus photography, the rate of change in focal length can be increased without moving the flash emission part significantly. Although the flash light emitting unit is structured to move in the embodiment, the flash light emitting unit may be fixed.

In the above embodiments, the photographic optical path system that directly reaches the aperture 1c from the photographic lens 18 corresponds to the first photographic optical path system of the present invention, and the short focus lens opening 8b serves as the first incident window of the present invention. Correspondingly, the photographic optical path system from the photographic lens 18 to the aperture 1c via the converter lens 25, the fixed reflection mirror 24, and the movable mirror 20 corresponds to the second photographic optical path system of the present invention, and the aperture for the long focus lens. The portion 8b corresponds to the second entrance window of the present invention, and the strobe protector 3a corresponds to the flash light emitting portion of the present invention.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a camera capable of changing the focal length that can achieve both miniaturization and mitigation of the red-eye phenomenon during flash photography, and its effectiveness is extremely high. .

[Brief description of drawings]

FIG. 1 (a) is a perspective view of the camera according to the embodiment of the present invention when not in use, as seen from the front, and FIG. 1 (b) is a plan view showing the main structure inside the camera in the state of FIG. 1 (a). Figure, Figure 1 (c)
Is a schematic view showing the main structure inside the camera as seen from the direction CC in FIG. 1 (b), and FIG. 2 (a) is a perspective view of the camera of FIG. (b) is Fig. 2 (a)
2 is a plan view showing the internal structure of the camera in the state of FIG.
FIG. 3C is a schematic view of the inside of the camera viewed from the direction CC in FIG. 2B, FIG. 3A is a front perspective view of the camera of FIG. 1 at the time of long-focus shooting, and FIG. FIG. 3B is a plan view showing the internal structure of the camera in the state of FIG. 3A, and FIG.
FIG. 4B is a schematic view of the inside of the camera viewed from the direction CC, and FIGS. 4A and 4B are schematic perspective views showing the posture of the lens holding frame of the camera of FIG. 1 ... Camera body, 1a ... Spool chamber 1b ... Patrone chamber, 1c ... Aperture 1d ... Battery chamber, 2 ... Slide cover 2a ... Finder eyepiece hole 2c ... Shooting lens opening 2b ... Pin, 3 ... Protection plate 3a ... Strobe protector 3b ... Finder window, 3c ... AF light emitting window 3d ... AF light receiving window, 4 ... Protection plate (barrier) 4a, 4b ... Pin 5 ... Film winding Spool 6 ... Patrone, 7 ... Back cover 8 ... Front decorative plate 8a ... Long focus lens opening 8b ... Short focus lens opening 9 ... Back decorative plate, 10 ... AF receiving lens 12 ... … Light receiving element, 13 …… Eyepiece lens 14 …… Frame reflecting lens 15 …… Short focus objective lens 16 …… Long focus objective lens 17 …… Switching lever, 18 …… Projection lens 19 …… Lens maintenance Frame, 20 ... Movable mirror 20 ... Mirror holding frame, 22 ... Shading wall 23 ... Shutter, 24 ... Fixed reflection mirror 25 ... Converter lens 26 ... Shutter 27, 28 ... Slide lever 29, 30 ... ... Structural member pins 33, 34 ... Structural member, 36 ... End face cam 36b ... Gear, 39 ... Gear

Claims (1)

[Claims] 1. A first photographing optical path system, a first entrance window for making photographing light incident on the first photographing optical path system, and a second photographing optical path having a focal length longer than that of the first photographing optical path system. A system, a second entrance window for allowing shooting light to enter the second shooting optical path system, and a distance from the second entrance window that is farther than a distance from the first entrance window. A camera having a flash light emitting part.