JPH11305314A - Camera and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a camera system which can be utilized as a camera having different functions by attaching plural lens units to a body unit on an image pickup side. SOLUTION: This camera system is constituted so that the lens unit 2 incorporating a photographing lens 201, a range-finding device and a focus driving device can be attached to the body unit 1 provided with an aperture part in front of photographing media 126 and 140 by being engaged with the aperture part. Besides, the lens unit incorporating a TTL finder, the photographing lens and the focus driving device can be also attached to the unit 1. Thus, the photographing actions corresponding to the different functions can be executed by attaching either of the above mentioned different lens units to the body unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera comprising a body unit on the imaging side and a lens unit on the optical system, and a camera unit comprising a body unit and a plurality of types of lens units.

[0002]

2. Description of the Related Art A lens unit in a conventional interchangeable lens camera has a photographing lens, an aperture, a focus control mechanism, and the like, and can cope with various photographing by exchanging lenses. When the above lens unit is used, the camera becomes large, the operation becomes complicated, and the usability is not good. On the other hand, a lens-non-exchangeable camera has the advantage of being compact and easy to shoot, although the lens cannot be exchanged. However, when it is necessary to perform various shootings for interviews, etc., there is a problem that the camera user needs to carry multiple cameras in order to properly use them according to the shooting purpose, and the purchase cost of the camera increases. there were.

To solve the above-mentioned problem, a unit-type photographing apparatus is disclosed in Japanese Patent Laid-Open Publication No. Hei 3-83032. This photographing apparatus is composed of a body unit, a "finder unit to which a photographing lens can be attached" attachable to the body unit, and a "finder unit with a photographing lens". Device.

The body unit includes a film feeding unit,
A shutter, a TTL AF (auto focus) sensor, a mirror for an AF sensor, a lens contact, a finder contact, and the like are built in. The “finder unit to which a photographing lens can be attached” has a mount to which an interchangeable lens can be attached, a TTL finder, and a finder contact. The "finder unit with photographing lens" has a photographing lens, a non-TTL type finder, a lens contact portion, a finder contact portion, and the like.

[0005] When an interchangeable lens is attached to the "finder unit to which a photographing lens can be attached" and combined with a body unit, it can function as a conventional lens interchangeable camera. When the "finder unit with photographing lens" and the body unit are combined, the camera can function as a conventional non-lens interchangeable camera.
Therefore, it is not necessary to purchase two types of cameras or carry two cameras, and it is possible to cope with each use.

Another conventional example is disclosed in Japanese Patent Application Laid-Open No. 3-202.
The photographing device disclosed in Japanese Unexamined Patent Publication No.
It has the same configuration as that of the photographing apparatus disclosed in Japanese Patent No. 83032, but has a structure in which the AF sensor mirror is pushed down in the direction of the AF sensor surface when the finder unit is removed.

Since the AF sensor in the photographing device is provided in the body unit, the AF signals for the "finder unit to which the photographing lens can be mounted" and the "finder unit with the photographing lens" are the same signal. , Can be used in common for both units.

On the other hand, conventionally, there is an interchangeable lens having a built-in AF sensor, an AF motor, a zoom motor, and a battery for the motor. In this case, the interchangeable lens can function independently of the body unit. It does not consume the battery on the body unit side.

[0009]

Generally, a photographing lens, particularly a wide-angle lens, has a small open aperture value, a good depiction performance, and a small size by shortening the distance from the photographing lens to the film, that is, by shortening the flange back. It is also advantageous for conversion. However, in the "unit with photographing lens" applied to the photographing device of JP-A-3-83032, the finder is reduced in size, but is blocked by the AF sensor mirror of the body unit to shorten the flange back. Can not do.

[0010] In addition, an interchangeable lens is separately mounted on the "finder unit on which the photographing lens can be mounted".
A drive mechanism such as a focus control motor is incorporated in the interchangeable lens, and the lens itself becomes larger. Therefore, since the finder unit with the interchangeable lens is further attached to the body unit, the balance of weight, shape, and the like is deteriorated.

When there are a plurality of types of body units having different AF ranges, the AF
Unless a finder imaging unit is provided in a “finder unit to which a photographing lens can be attached” according to a sensor, an AF range such as three-point distance measurement cannot be displayed.

[0012] Further, when the distance is measured by an AF sensor built into the body unit in the photographing device, the aperture is determined by the photographing lens of the finder unit or the photographing lens to be mounted. Therefore, in the case of a lens having a bright open aperture, the aperture of the AF sensor is also brightened to improve the distance measurement accuracy. However, in the case of a dark lens, the AF accuracy is reduced. If the subject distance measurement method is a non-TTL method, the problems of flange back and open aperture value can be avoided, but the accuracy of distance measurement deteriorates when using a telephoto lens or when the subject is far away.

On the other hand, according to the photographing device disclosed in Japanese Patent Laid-Open No. 3-202826, an interlocking mechanism for retracting and driving the AF sensor mirror when the finder unit is removed is required, which complicates the structure and increases the body unit. Also increase in size.

The present invention has been made in view of the above problems, and can be used as a camera having different functions by attaching a plurality of lens units to a body unit on the image pickup side. And the balance of the whole camera at the time of use is good and the A
It is an object to provide a camera or a camera system capable of obtaining F accuracy.

[0015]

According to a first aspect of the present invention, there is provided a camera for holding a photographing medium in a state capable of photographing, a body unit having an opening provided on a front surface of the photographing medium;
An image pickup lens that forms a subject image on the photographing medium; and a focus adjustment unit that performs focus adjustment of the image pickup lens in accordance with a subject distance, wherein the focus adjustment unit is mounted on the body unit. A lens unit configured to fit into the opening of the body unit, and the photographing can be performed with the lens unit mounted on the body unit.

According to a second aspect of the present invention, in the camera according to the first aspect, the focus adjustment means includes a focus detection optical system, a focus detection sensor, and a circuit for reading an output from the focus detection sensor. Including.

According to a third aspect of the present invention, there is provided a camera system which holds a photographing medium so as to be capable of photographing, forms a body unit having an opening on the front surface of the photographing medium, and forms a subject image on the photographing medium. At least focus adjusting means for adjusting the focus of the taking lens in accordance with the focusing state of the taking lens, such that the focus adjusting means fits into the opening of the body unit when attached to the body unit. A first lens unit configured, an imaging lens that forms an image on the photographing medium, a finder device, and a detection unit that detects a focus state; and a focus adjustment unit that performs focus adjustment based on the detected focus state. A light guiding unit for guiding a light beam from the photographing lens to the finder device and the detecting unit; And a second lens unit configured to fit in the opening of the body unit, wherein the first lens unit or the second lens unit is configured to fit in the opening of the body unit. It is possible to selectively combine the second lens units.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. A camera system (camera) according to a first embodiment of the present invention will be described from the main configuration. The camera system includes a body unit 1 shown in a perspective view of FIG. 1 and three types of fixed lens units or lens intermediate units detachable from the camera body 1 shown in the perspective views of FIGS. . In the following description, when the “fixed lens unit and the lens-side intermediate unit” are collectively referred to as “lens unit”.

The body unit 1 is a unit that incorporates a film or a holding unit for a photographic medium of an image sensor, a drive control unit for the photographic medium, and the like. One of the lens units is a fixed lens unit 2 with a range finder (non-TTL finder), which is the first lens unit shown in FIG. 2, and the other is a second lens unit shown in FIG. Fixed lens unit 3 with TTL (TTL single lens reflex type) finder that is a lens unit
The other one is a lens-side intermediate unit 4 with a TTL finder, which is a second lens unit with a detachable interchangeable lens shown in FIG.

The body unit 1 includes a film 126 (see FIG. 5) as a photographing medium or a CCD / MOS
The medium holding unit 102 holds an image sensor 140 (see FIG. 6) such as a mold. A shutter 105 is provided on the front surface of the medium holding unit 102. If a shutter is provided on the lens unit side to be detached,
The shutter 105 is unnecessary.

The shutter 105 or a portion located on the front surface of the photographing medium, and is a concave lens unit mounting portion having a cutout in the center of the upper surface portions 103, 104 and the front surface portions 114, 115 of the body unit 1. Opening 11
1 is provided. The opening 111 is a portion surrounded by both side wall portions 112a and 112b and a bottom portion 113. On each of the two side wall portions 112a and 112b, each lens extending in the vertical direction in parallel with the imaging surface of the imaging medium. Unit insertion slits 107 and 108 are provided.

A rail unit of each lens unit described later is slid from above into the slits 107 and 108 to mount the lens unit on the opening 111. Then, the locking or unlocking of the mounted lens unit is performed by the lock member 110 provided on the front surface 115.

On the upper surface 103 of the body unit 1, a display device 117 is provided. On the upper surface 104, a release button 106 and setting operation buttons 116, which are operation members for setting a shutter speed and a photographing mode, are provided. Are arranged. Further, on the bottom portion 113, a communication contact portion 109 for transmitting and receiving a control signal to and from a lens unit such as a release switch output signal operated by a release button 106 and a shutter drive signal is provided.

However, the body unit 1 is not provided with an AF sensor, a focus motor, a zoom motor, a finder, and the like. Further, the shutter 105 of the body unit 1 is not always necessary. For example, when a shutter is built in the lens unit, the shutter of the body unit 1 may not be provided. Further, both a body having a shutter and a body without a shutter may be present as a body unit.

Next, the schematic structure of each of the lens units 2, 3, and 4 will be described first with reference to FIGS. Each of the lens units 2, 3, 4 is provided with rail portions 205, 206, 304, 305, 404, and 405 that can be fitted to the slits 107, 108 of the body unit 1 on both side surfaces. The rail section is provided along a vertical direction of a plane perpendicular to the optical axis O of the taking lens. The claw 1 of the lock member 110 of the body unit 1 is provided at an intermediate portion of each rail.
10a (see FIG. 7) is a notch 20 to be fitted at the time of mounting
8, 307 and 407 are provided.

Further, in addition to the above-mentioned common parts, the fixed lens unit 2 with a range finder has a perspective view of FIG.
Alternatively, as shown in the sectional views of FIGS. 9 and 10 described later, a taking lens 201 having an optical axis O, a diaphragm device, and a non-TTL
A range finder device 202 of a type, a focus detection device 203 as focus adjustment means, a strobe device 204 as an artificial illumination light emitting device, and a photometric device 209 are built in.

Further, the fixed lens unit 2 includes:
Based on the output of the focus detection device 203, the taking lens 201
A photographing lens driving motor, which is a focus adjusting means for driving the lens to a focusing position, a power supply battery, a charging capacitor,
A flash control circuit that controls charging and light emission of the flash device is also built in. Further, a contact portion that can be connected to the communication contact portion 109 for communicating with the body unit 1 is also provided.

When the fixed lens unit 2 is mounted on the body unit 1, the upper surface portion 212 of the fixed lens unit 2 is substantially flush with the upper surfaces 103 and 104 of the body unit 1, and 210
Are flush with the front portions 114 and 115 of the body unit 1. Therefore, all the members such as the finder device, the focus detection device, and the focus driving motor in the fixed lens unit 2 are accommodated inside the opening 111 of the body unit 1.

The fixed lens unit 3 with a TTL finder has a photographic lens system 301 and an aperture 322 which constitute a zoom lens as shown in FIG. 3 or a sectional view of FIG. A strobe device 350 which is an artificial illumination light emitting device, a TTL type finder device 309 (FIG. 11), a TTL type focus detection device 306 (FIG. 11) which is a focus adjusting means, and a TTL type photometric device are incorporated. Further, based on the output of the focus detecting device, a focus driving motor as a focus adjusting means for driving the photographing zoom lens to a focus position, and a zoom button 30
A zoom lens driving motor or the like for driving the zoom lens to a short focus or a long focus by the operation of the camera 2302 is built in.

The fixed lens unit 3 further includes a finder main mirror as light guiding means for retreating from the photographing optical path during exposure, a sub-mirror as light guiding means for focus detection and photometry, and a condenser for strobe light emission. A flash control circuit for charging control and light emission control; a battery for power supply; and a communication contact portion 10 for communicating with the body unit 1
9, a strobe mounting mount 360, an external strobe light emission start terminal 361, an external strobe light emission stop terminal 362, and the like are also provided.

When the fixed lens unit 3 is mounted on the body unit 1, the fixed lens unit 3
The portion surrounded by the side surface 308 and the front surface 310 is located inside the opening 111 of the body unit 1. Therefore, the mirror built in the fixed lens unit 3
The members such as the focus detection device, the focus driving motor, and the zoom driving motor are connected to the opening 111 of the body unit 1.
Will fit inside.

The lens-side intermediate unit 4 with a TTL finder has a mount 401 for attaching and detaching an interchangeable lens 501 as shown in FIG. 4 or a sectional view of FIG. Device 409
(FIG. 12) and a TTL focus detection device 411 (FIG. 12).
A TTL photometric device, and a finder main mirror 427, which is a light guiding unit that retreats from the photographing optical path during exposure.
A mirror control member 422 and a sub-mirror, etc., which are light guide means for focus detection and photometry are built in. The mount 401 for the interchangeable lens is provided with a locking portion 402 that can be locked to a locked portion 503 provided on the mount 502 on the interchangeable lens 501 side.

Further, the lens side intermediate unit 4 has a contact portion connectable to the communication contact portion 109 for communicating with the body unit 1, a strobe mount 460 for mounting an external strobe, and a light emission start terminal for the external strobe. 461
Also, a light emission stop terminal 462 for an external strobe is provided.

When the lens-side intermediate unit 4 is mounted on the body unit 1, the portion surrounded by the side surface 408 and the front surface 410 of the intermediate unit 4 fits inside the opening 111 of the body unit 1. . Therefore, members such as a mirror member and a focus detection device built in the lens side intermediate unit 4 are accommodated inside the opening 111 of the body unit 1. Further, each of the fixed lens units 2 and 3 or the lens-side intermediate unit 4 may be configured to include a shutter unit.

Next, the internal structure of the body unit 1 and each of the lens units 2 and 3 and the lens side intermediate unit 4 will be described in detail. 5 and 6 are cross-sectional views showing the internal structure of the body unit 1. FIG. FIG. 5 is a cross-sectional view of a body unit using the photosensitive film 126 as a photographic medium, as viewed from above. FIG. 6 is a cross-sectional view of a body unit using the image sensor 140 as a photographic medium, as viewed from above. , Each shaded portion indicates the cross-sectional shape of the body of the body unit. In the following description, the body using the film 126 as a photographic medium is referred to as a body unit 1A, and the image sensor 1
A body using 40 as a photographing medium is referred to as a body unit 1B.

First, the internal structure of the body unit 1A will be described. As shown in FIG.
The photosensitive film 126 stored in the
And the guide roller 127 winds it up one frame at a time.
Further, the film 126 includes a flat plate 129 and a leaf spring 130.
Is pressed against the film guide rail 128,
It is held so that it can be fed.

The shutter 105 is disposed on the opposite side of the film 126 with respect to the film guide rail 128, and controls the shutter charge, shutter drive, and the like by a built-in shutter control member 122. The sequence motor 123 is disposed near the shutter control member 122, drives the spool 125, feeds and rewinds the film, and charges the shutter 105. It should be noted that a well-known technique can be applied as a technique for performing these control drives with a single motor 123.

The communication contact portion 109 is connected to the body unit 1A.
It is provided on the bottom surface portion 113 inside the opening for transmitting and receiving signals to and from the mounted lens unit. Also,
A control circuit 132, which is a drive control unit, is provided at the front of the film cartridge chamber, and performs film feeding, shutter charging, shutter running, communication control with the lens unit, and the like.

The battery 124 includes a sequence motor 123 having a built-in body unit, a shutter 105, and a drive control circuit 1.
Although a power supply unit such as 32 is provided, it is also possible to supply power to the lens unit via a part of the communication contact unit 109. Note that if a small battery is used, a plurality of batteries can be housed vertically.

The slits 107 and 108 for mounting the lens unit are provided in parallel with the film guide rail 128 and have the same structure as the hatched portion of the body unit 1 together with the film guide rail. The direction of 108 is accurately kept parallel to the surface of the film 126.

On the other hand, each mounted lens unit 2,
3, the mounting rail 205 on the lens side intermediate unit 4 side,
206, or 304, 305, or 404, 4
05 is provided along the direction perpendicular to the optical axis O of the photographing lens,
6 can be accurately held vertically.

The lock lever 110 is slidably mounted in the lens unit mounting slit 108, and is urged toward the slit 108 by a spring 121. At the tip of the lock lever 110, cutouts 208, 307,
A pawl 110a (see FIG. 7) that engages with 407 is provided.

Next, the internal structure of the body unit 1B will be described. As shown in FIG. 6, the image sensor 140 such as a CCD or a MOS type is pressed against the image sensor guide plate 128A by a leaf spring 141, and It is held inside. The shutter 105 is provided on the opposite side of the image sensor 140 with the image sensor guide plate 128 interposed therebetween. The shutter 105 is driven by a shutter control member 122 to be driven by a shutter, and is driven by a sequence motor 123 to be charged.

In addition, the battery 124, the control circuit 132, the communication contact portion 109, the lock member 110, and the like are provided in the body unit 1B, similarly to the body unit 1A. However, in the case of the main body unit 1B to which the imaging element 140 is applied, the battery 124 does not require the spool 125 of FIG.
Can be stored side by side in a plurality.

The control circuit 132 controls the shutter 105
, Control of communication with the lens unit, and control of the image sensor 140, but do not feed or rewind the film.

A slit 1 for mounting a lens unit
Reference numerals 07 and 108 are provided not in parallel with the film rail but in parallel with the image sensor guide plate 128A, and together with the image sensor guide plate 128A, form the same structure (shaded portion) of the body unit 1B to obtain an image. The parallelism with the element 140 is maintained. Then, the image sensor 140 can be accurately held in the vertical direction with respect to the optical axis O of the lens unit to be mounted.

Next, the body unit 1 (1A, 1
Locking and unlocking operation when the lens unit is attached to and detached from B) will be described with reference to FIGS. 7A and 7B. FIGS. 7A and 7B are longitudinal cross-sectional views of the periphery of the lock unit when the lens unit is mounted on the body unit, viewed from the optical axis direction. FIG. FIG. 7B shows the relationship between the rail of the lens unit and the lock member lever of the body unit when the mounting is completed. However, the case where the fixed lens unit 2 is mounted among the lens units will be described, but it is assumed that the other fixed lens unit 3 and the lens side intermediate unit 4 are similarly attached and detached.

When the fixed lens unit 2 is mounted, the rails 205, 206 of the lens unit 2 are inserted into the slits 107, 108 of the body unit 1. then,
Claw 110a of lock member 110 in slit 108
Is pushed by the rail 206 as shown in FIG.
Once, retreat. When the fixed lens unit 2 is inserted to the mounting position, as shown in FIG.
The zero claw 110a fits into the notch 208 of the rail 206 to be in a locked state, and the mounting is completed.

When removing the fixed lens unit 2 from the body unit 1, the fixed lens unit 2 can be removed by sliding the fixed lens unit 2 upward while operating the lock member 110 to retract to the right.

Next, the connection state between the communication contact portion 109 and the control circuit contact portion on the lens unit side when the lens unit is mounted on the body unit 1 will be described with reference to the longitudinal sectional view of FIG. FIG. 8 is a longitudinal sectional view around the communication contact portion of the lens unit and the body unit in a state where the lens unit is completely mounted on the body unit. The communication contact portion 109 on the body unit 1 side includes a plurality of conductive pin contacts, and FIG. 8 is a cross-sectional view around one of the contact pins. Although the case where the fixed lens unit 2 is attached and connected among the lens units will be described, it is assumed that the connection is similarly made for the other lens units 3 and 4.

The pin contact 191 of the communication contact portion 109
Are inserted through through holes of a support plate 192 provided on the bottom surface 113 of the body unit opening 111 and are urged upward by a spring 194. When the lens unit is not mounted, the tip of the pin projects upward with the flange in contact with the support plate. Therefore, when the fixed lens unit 2 is mounted, the pin contact 191 of the communication contact unit 109 is connected to the control circuit 224 of the lens unit 2 as shown in FIG.
And is electrically contacted by the contact 224a. In this state, the control circuit 224 on the lens unit side is electrically connected to the connection control circuit 193 on the body unit side, so that mutual information signal communication and power supply are possible.

The pin contact may be provided on the lens unit side. Further, a conductive leaf spring contact or the like may be used without using the pin contact. Furthermore, body unit 1
The communication contact portion 109 may be provided on the side wall surface of the opening 111 or inside the mounting slit instead of the bottom 113 of the opening 111. By arranging the communication contact at a place where it enters into the inside from the body unit opening in this way, it is less likely that the lens unit is accidentally touched when the lens unit is removed, and the control circuit is destroyed by static electricity or short circuit. Also, the risk of mechanical damage to the contacts is reduced. The communication means is not limited to the pin contact type, and a non-contact type communication means such as optical communication or electromagnetic wave communication may be applied.

Next, the internal structure of the fixed lens unit 2 with a range finder and the state of attachment to the body unit 1 will be described with reference to FIGS. FIG.
Is a longitudinal sectional view showing an internal arrangement in a state where the range finder type fixed lens unit 2 is mounted on the body unit 1, and a two-dot chain line indicates a boundary between the units. FIG.
0 is a cross-sectional view showing the arrangement of the fixed lens unit 2 with a range finder when viewed from above. However, the case where the body unit 1 to be mounted is a photosensitive film or an imaging device will be described.

The fixed lens unit 2 has a photographic lens 20 having an aperture as described in the schematic configuration.
1, range finder device 202, focus detection device 20
3, a strobe device 204, a photometric device 209, and the like are built in.

The photographing lens 201 includes a driving gear 2
The focus is adjusted by being driven forward and backward in the optical axis direction by a focus motor 223 via 21. Also, the aperture 22
0 is a diaphragm driving member 22 composed of a stepping motor or the like.
2 controls the narrowing and opening.

The strobe device 204 disposed above the lens unit 2 has a strobe light emitting tube 229 as a light source for irradiating a subject inside a strobe window. In addition, a control drive battery 225 also serving as a strobe light and a strobe capacitor are incorporated. The strobe device 204 using a strobe light emitting tube as a light source is:
Depending on the purpose, an artificial lighting device such as an incandescent lamp or LED may be used.

The range finder device 202 is disposed above the lens unit 2 and includes an objective lens 219,
Screen 226, prism 227, eyepiece 2
28, the real image of the subject formed on the screen 226 can be observed through the eyepiece 228.

As shown in FIG. 10, the focus detecting device 203 includes a condenser lens 232 and a well-known PSD (Position Sensitivity).
ng Diode), focus detection sensor 2 such as CCD or MOS type
Consists of 30. An object distance is measured by the focus detection device 203, and the photographing lens 201 is driven forward and backward by a focus motor 223 based on the detection signal to perform autofocus control.

As shown in FIG. 10, the photometric device 209 includes a condenser lens 211 and a photometric sensor 231 such as a well-known CdS or photodiode, and measures the brightness of a subject.

Processing such as drive control of the above-mentioned focus motor and aperture stepping motor, light emission control of a strobe light emitting tube, distance measurement control by an output signal of a photometry sensor, focus control, etc. The communication process is performed by the control circuit 224. Communication with the body unit 1 and power supply are performed via a contact portion of the control circuit 224 of the lens unit and a pin contact 191 of the body unit communication contact portion. Note that power may be supplied from the body unit to the lens unit 2 side, or a battery 225 may be built in the lens unit 2 as shown in FIG. The focus driving means such as the focus motor 223 and the driving gear 221 may be housed in the body unit.

When the fixed lens unit 2 configured as described above is mounted on the body unit 1 to perform imaging,
First, an imaging condition is set with the operation setting button 116 in the mounted state, and when the release button 106 is operated, the subject light transmitted through the photographing lens 201 and the aperture 220 receives the photosensitive light of the body unit 1 through the shutter 105. An image is formed as an object image on the film 126 or the image sensor 140, and imaging is performed.

The camera system in which the fixed lens unit 2 is mounted on the body unit 1 can be used as a range finder camera. According to the camera system, since ranging, photometry, and focus control of the subject can all be performed inside the fixed lens unit 2, each sensor or control member has the performance most suitable for the photographing lens 201. In addition, a lens unit having a necessary and sufficient size and cost can be used, and a compact and high-performance camera system can be provided. For example, when a lens having a large depth of field such as a “wide-angle lens” is used as a photographing lens, the distance measurement accuracy on the far side is unnecessary. Things can be applied.

The motor, sensor, control circuit and power supply inside the fixed lens unit 2 are accommodated in the opening of the body unit 1 when the unit 2 is mounted on the body unit 1. Therefore, in the photographable state mounted on the body unit, there is no protrusion, and the photographing operation is not hindered.

In the fixed lens unit 2 shown in FIG. 9, a single focus lens without a zoom function is applied as the photographing lens 201. However, a zoom lens can be used. And a built-in motor.

Next, the internal structure of the TTL finder type fixed lens unit 3 and the state of attachment to the body unit 1 will be described with reference to FIG. FIG.
FIG. 3 is a layout view showing a vertical section in a state where the TL finder type fixed lens unit 3 is mounted on the body unit 1, and a two-dot chain line indicates a boundary between the units.

TTL finder type fixed lens unit 3
As described above, the photographing lens system 301 and the strobe device 35, which is an artificial illumination light emitting device, have already been described.
0, a TTL finder device 309, a TTL focus detection device 306, a TTL photometric device, and the like.

The photographing lens system 301 includes a focus lens 319 and a zoom lens 324. The focus lens 319 is driven forward and backward in the optical axis direction by a focus motor 321 via a drive gear 320. Focus adjustment is performed. The zoom lens 32
4 is a zoom motor 326 via a drive gear 325
, The lens is driven forward and backward in the optical axis direction, and focal length adjustment (zooming) is performed. The diaphragm 322 is driven to be narrowed down and opened by a diaphragm driving member 323 such as a stepping motor.

The finder device 309 is a TTL type finder disposed above the fixed lens unit 3 and comprises a main mirror 334, a screen 335, a lens 338, a roof prism or a roof mirror 336, and an eyepiece 337. The subject image transmitted through the photographing lens by the finder device 309 and formed on the screen 335 can be observed through the eyepiece 337.

The focus detection device 306 includes a main mirror 33
4 and a splitter 331.
And a focus detection sensor 332 such as a CCD or MOS type. The subject light that has passed through the photographing lens passes through the center of the main mirror 334, is reflected by the sub-mirror 333, is partially refracted by the splitter 331 in the direction of the focus detection sensor 332, and enters the sensor 332. The focus and distance of the subject are measured from the incident subject light. The autofocus control is performed by driving the focus lens 319 based on the measurement result.

The photometric sensor 330, which is a photometric device,
It is composed of S and a photodiode. Part of the subject light transmitted through the taking lens and transmitted through the splitter 331 enters the photometric sensor 330, and the brightness of the subject is measured. The subject light to the photometric sensor 330 may be reflected light from the film being exposed. In this case, light emission stop control at the time of flash light emission can be performed by direct photometry.

The main mirror 334 is connected to the link mechanism 3
29 is connected to a mirror control member 328 including a plunger or a motor. By the operation of the mirror control member 328, the main mirror 334 can be retracted outside the photographing optical path and returned to the optical path.

The strobe device 350 is disposed above the lens unit 3 and has a strobe light emitting tube 351 as a light source for irradiating a subject inside the strobe window. Further, a control battery 352 also serving as a strobe light and a strobe capacitor are built in. The strobe device 350 using a strobe light emitting tube as a light source may be replaced with an artificial lighting device such as an incandescent lamp depending on the purpose.

The driving of the focusing motor and the stepping motor, the light emission of the strobe light emitting tube, the distance measurement control based on the output signal of the photometric sensor, the focus control, and the communication processing of the body unit 1 for the control are as follows. This is performed by the control circuit 327. Further, communication connection with the body unit 1 and power supply are performed via a contact portion of the control circuit 327 and a pin contact 191 of the body unit communication contact portion. The power supply unit may be supplied from the body unit 1 side, or may be supplied from the lens unit 3 side.

When the fixed lens unit 3 configured as described above is mounted on the body unit 1 to perform imaging,
First, the imaging condition is set with the operation setting button 116 in the mounted state, and the release button 106 is operated.
34 is retracted outside the photographing optical path, and the subject light transmitted through the photographing lens system 301 and the aperture 322
05 through the photosensitive film 12 of the body unit 1
6, or an image is formed as an object image on the image sensor 140, and imaging is performed.

The camera system in which the fixed lens unit 3 is mounted on the body unit 1 can be used as a TTL finder camera. When the fixed lens unit 3 is used, a motor, a sensor, a mirror, a control circuit, a power supply and the like inside the lens unit are accommodated in the opening 111 of the body unit when mounted on the body unit 1. Therefore, in a photographable state attached to the body unit 1, there is no protrusion other than the TTL finder portion and the photographing lens portion, and the photographing operation is not hindered.
Operation becomes easier.

The distance measurement, photometry, and focus control for the subject are all performed inside the fixed lens unit 3. Therefore, each sensor and control member can use a lens unit having a performance most suitable for the photographing lens system 301 and a necessary and sufficient size and cost, and as a result, a compact and high-performance camera system can be provided.

If a retractable lens barrel is employed as a modification of the taking lens of the fixed lens unit 3, the taking lens can be carried in the retracted storage state in the opening 111 of the body unit 1. Become.

Next, the internal structure and mounting state of the lens intermediate unit 4 with a TTL finder will be described with reference to FIG.
Mounting state of the body unit 2 and the intermediate unit 4,
Further, description will be made with reference to a longitudinal sectional view showing the interchangeable lens before mounting. In the drawing, the two-dot chain line indicates the boundary between the units.

The lens-side intermediate unit 4 includes the lens mount 401, the finder device 409, the focus detection device 411, the photometry device, the main mirror 427, the sub-mirror 428, and the like as described in the schematic configuration. It is detachable from the opening 111 of the body unit 1. Further, a plurality of types of interchangeable lenses 5 can be attached and detached via the intermediate unit side mount 401.

The interchangeable lens 5 has a mount 502,
Shooting lens 501, aperture 510, aperture control lever 5
11 are provided. The aperture control lever 511 is
The aperture interlocking member 4 of the lens side intermediate unit 4 in the mounted state
The control unit 20 controls aperture stop and opening of the interchangeable lens.

The interchangeable lens 5 can be a so-called manual lens which does not include the above-described focus control motor and aperture control motor. However, a modified example in which a focus control motor and an aperture control motor are built in and a communication contact point with the lens side intermediate unit 4 is provided as an interchangeable lens of the modified example can be proposed. In the interchangeable lens of this modified example, autofocus control and electric aperture control are performed via the intermediate unit 4 according to the instruction of the body unit 1.

The finder device 409 includes a main mirror 427, a screen 435, a lens 438, a roof prism or a roof mirror 436, and the eyepiece 43.
7, the subject image transmitted through the photographing lens 501, reflected by the main mirror 427 and formed on the screen can be observed through the eyepiece 437.

The main mirror 427 includes a plunger,
Alternatively, it is driven via a link mechanism 423 by a mirror control member 422 such as a motor, and a retreat drive to the outside of the photographing optical path at the time of exposure and a return drive to the inside of the photographing optical path except during the exposure are performed. Further, the power of the mirror control member 422 is transmitted via a transmission gear 421 to a rack-shaped aperture interlocking member 420.
Is also transmitted to The aperture interlocking member 420 is engaged with the aperture control lever 511 of the mounted interchangeable lens 5. Therefore, the stop 510 of the interchangeable lens is stopped down in conjunction with the retreat of the main mirror 427 out of the shooting optical path. The aperture 510 is opened in conjunction with the return of the main mirror 427.

The focus detecting device 411 includes a sub mirror 428 fixed to a main mirror 428 and a splitter 4.
25 and a focus detection sensor 426. The sub-mirror 428 guides the subject light transmitted through the central portion of the main mirror to the splitter 425. The splitter 42
The light split by the focus detection sensor 4
26 and a photometric sensor 424 described later. In addition,
The sub-mirror 428 and the splitter 425 guide the light in the central part of the subject light to each sensor. However, a sub-mirror or a prism that guides the subject light not only in the central part of the subject light but also in other parts is provided. May be.

The focus detection data by the focus detection device 411 is used as focus control data when an interchangeable lens having a built-in focus lens drive unit is mounted on the lens side intermediate unit 4. That is, a part of the subject light transmitted through the photographing lens enters the focus detection sensor 426 of the focus detection device 411 in a state where the interchangeable lens with a built-in focus control motor is mounted, and the focus and distance of the subject are determined from the subject image. Is measured. On the basis of the measurement result, the body unit 1 displays the in-focus / out-of-focus state and the subject distance, and further drives the photographing lens based on the subject distance information to perform autofocus control.

The photometric sensor 424 constituting the photometric device
Is transmitted through the photographing lens 501 and the sub-mirror 42
8. Measure the brightness of a part of the subject light incident via the beam splitter 425. The diaphragm 510 is controlled based on the measurement result.

The control of the motors and sensors (photometry, distance measurement, etc.) and communication with the body unit 1 are performed by a control circuit 419. The connection for communication and power supply with the body unit 1 is performed via the contact portion of the control circuit 419 and the pin contact 191 on the body unit 1 side. Further, the power may be supplied from the body unit 1 or a battery serving as a power may be built in the lens side intermediate unit 4.

When imaging is performed by combining the lens side intermediate unit 4 configured as described above with the body unit 1, the interchangeable lens 5 is mounted on the lens side intermediate unit 4, and imaging conditions are set by the operation setting button 116. . Then, when the release button 106 is operated, the main mirror 427 retreats outside the photographing optical path, and the subject light transmitted through the photographing lens 501 and the aperture 510 passes through the shutter 105 to the photosensitive film 126 of the body unit 1 or Then, an image is formed on the image sensor 140 as a subject image, and imaging is performed.

According to the camera unit having the combination of the lens-side intermediate unit 4 and the body unit 1 described above, the distance measurement and photometry for the subject can be performed inside the intermediate unit. A small, high-performance lens-side intermediate unit having high performance, a sufficient and sufficient size and cost can be used. Further, a conventional manual interchangeable lens can be attached to the intermediate unit 4 and used effectively. It should be noted that a lens having a built-in autofocus or an electric aperture control can be used if a communication contact is provided in the lens side intermediate unit 4.

On the other hand, the motors, sensors, and control circuits built into the lens-side intermediate unit 4 are housed inside the opening 111 of the body unit 1 when mounted on the body unit 1. Therefore, even when mounted on the body unit 1, there are no projecting parts other than the finder device and the interchangeable lens unit, and the photographing operation is not hindered, so that the usability is good.

As described above, according to the camera system of the present embodiment, the lens units 2, 3, and 4 mounted on the body camera 1 are balanced in weight and project in shape. Since there are few parts, the shooting operation can be easily performed with any combination. In addition, a plurality of lens units 2 and one
Regardless of which one of the lenses 3 and 4 is mounted, the focus adjustment device is incorporated in each lens unit, so that high AF accuracy can be obtained in each combination state.

When the lens units 3 and 4 are applied to the present camera system, a mechanism for driving the main mirror is built in the lens unit, and no mirror interlocking mechanism from the body unit is provided. Therefore, there is no need for a mechanism for retracting the interlocking mechanism when the unit is removed as in the above-described conventional photographing apparatus, and the configuration is simplified. Further, since there is no interlocking mechanism, the flange back of the lens can be further reduced. Further, when the lens units 3 and 4 are applied to the camera system, focus detection by the TTL method is possible,
The AF accuracy does not decrease even when photographing with a telephoto lens or a dark subject.

Next, a fixed lens unit 2A with a range finder according to a modification of the fixed lens unit 2 with a range finder shown in FIGS. 2 and 9 will be described with reference to FIG. FIG. 13 is a vertical cross-sectional view showing an arrangement when the fixed lens unit 2A of the modified example is mounted on the body unit 1.

The fixed lens unit 2A of this modification is different from the fixed lens unit 2 in that
The TTL focus detection and the photometry are performed by reflecting the subject light transmitted through the lens to the sensor side with a built-in movable mirror. The other configuration is the same as the configuration of the fixed lens unit 2 shown in FIG. 9, and therefore, only different portions will be described below. The fixed lens unit 2A is provided with a movable mirror 245,
At the time of focus detection and at the time of photometry, the subject light transmitted through the photographing lens 201 is reflected downward by the movable mirror 245 and guided to the splitter 243. The subject light is split by the splitter, and enters the focus detection sensor 244 and the photometry sensor 242, respectively.

The focus detection sensor 244 measures the focus and distance of the subject from the incident subject image. Focus control of the photographing lens is performed based on the measurement result. Also,
The photometric sensor 242 measures the luminance of the incident subject light, and the aperture is controlled based on the measurement result. The photometry by the photometry sensor 242 may be performed by making the reflected light from the film being exposed enter. With this reflected light, emission stop control during flash emission can be performed by direct photometry.

The movable mirror 245 is driven to rotate via a link mechanism 241 by a mirror control member 240 such as a plunger or a motor. When detecting the subject light with the sensors 244 and 242, the sensor 244 and the sensor 242 are driven so as to be moved into the photographing optical path, and at the time of photographing, are retracted out of the photographing optical path.

The fixed lens unit 2A of this modification performs focus detection with subject light transmitted through the photographing lens 201, so that more accurate focus detection is possible.
It is suitable for an autofocus lens having a long focal length such as a telephoto lens. The motor, sensor, and control circuit inside the fixed lens unit are housed in the opening 111 of the body unit 1 when mounted on the body unit 1. Therefore, even when the body unit is mounted, there is no protrusion, and the photographing operation is not hindered, so that the usability is good.

Next, a camera system according to a second embodiment of the present invention will be described. In the camera system of the first embodiment, the upper surface portions 103 and 104 and the front surface portions 114 and 115 of the body unit 1 shown in FIG. The opening 111 was formed. On the other hand, as shown in the perspective view of FIG. 14, the body unit 6 of the present camera system is provided with a ring-shaped mount 607 similar to a conventional lens mount for an interchangeable lens as an opening for mounting the lens unit. ing.

FIG. 14 is a perspective view showing the appearance of the body unit 6 and the mountable lens unit 7 of the camera system according to the present embodiment. FIG.
FIG. 3 is a longitudinal sectional view showing an arrangement in a state where a lens unit is mounted. The two-dot chain line indicates the boundary between the body unit and the lens unit. FIG. 16 is a view of the lens unit 7 as viewed from the rear (photographing medium side), and shows a contact state of the pin contact 610 for communication with the control circuit contact portion 703.

The body unit 6 is provided with a mount 607 which is a ring-shaped opening to which the lens unit 7 can be attached and detached.
Is provided. Furthermore, a release button 601, a shooting mode setting member 602, a finder device 603, a photometric device 604, and an artificial lighting device 6 such as a strobe or a light bulb.
05, a shutter 606, and the like. Note that these devices can be built in the upper protruding portion inside the lens unit 7 side as in the above-described embodiment.

The artificial light illumination device 605 is a device for irradiating a subject with a light source 616 such as an incandescent lamp or a strobe light tube. The finder device 603 includes an objective lens 61
0, a screen 612, a prism 611, and an eyepiece 613, and a real image of a subject formed on the screen 612 can be observed through the eyepiece 613.

Further, in the body unit 6, a photographic medium 614 such as a photosensitive film or an image sensor is held in a subject light image forming portion, and a shutter 606 is provided on the front surface thereof. Further, a photometric sensor (not shown) is provided to measure the luminance of the subject. The body unit 6 has a pin contact 6 for communicating with the lens unit 7.
10, and can make electrical contact with the communication contact 703 on the lens unit 7 side.

On the other hand, the lens unit 7 mainly has a mount 730 for the body unit 6, and further includes a photographing lens 701, an aperture 704, a splitter 710,
A focus detection sensor 708 as a focus detection device, a driving gear 705 and a focus motor 706 as focus control means, an aperture driving member 707 including a stepping motor, a control circuit 709, a communication contact portion 703
And so on. Note that the motor, sensor, control circuit, and the like are behind the lens mount 730 (on the side opposite to the subject).
In the protruding portion 702. Also, the protrusion 70
A communication contact 703 for communication with the body unit 7 is provided on the outer peripheral portion of the body 2.

The mount 730 is mounted on the body unit 6
The lens unit 7 is mounted on the body unit 6 by fitting the two mounts.

The photographing lens 701 includes a driving gear 70
5 and the focus motor 706 are driven forward and backward in the optical axis direction to adjust the focus. The aperture 704 is driven by the aperture drive member 707, and aperture stop / open control is performed.

The subject light that has passed through the photographing lens 701 and split by the splitter 710 is incident on the focus detection sensor 708. Based on the image of the subject light,
The autofocus control is performed by measuring the focal point and the distance and driving the photographing lens 701 to the in-focus position.

The control of the motors and sensors (ranging and photometry), autofocus control, communication with the body unit, and the like are performed by the control circuit 709. Communication with the body unit and power supply are performed by the control circuit 709. This is performed via a contact 703 provided.

When taking a picture with this camera system,
First, the lens unit 7 is mounted on the body unit 6 via the mounts 730 and 607. When the release button 601 is operated in the mounted state, the subject light transmitted through the photographing lens 701 and the aperture 704 forms an image on the photographing medium 614 of the mounted body unit 6 after passing through the splitter 710, and the photographing is performed. Will be

As described above, according to the camera system of the present embodiment, in addition to the effects of the camera system of the above-described first embodiment, a motor, a sensor, a control circuit, etc. When the lens unit 7 is mounted on the body unit 6 because the lens unit 7 can be arranged in the body unit 702, the projection 702 is located inside the mount of the body unit 6, and therefore, in the case unit body opening, and the camera system is compact and photographed. Operation is not hindered, and shooting is easy.

The lens unit 7 may incorporate a zoom lens, a zoom motor, a battery, and the like.
By arranging in the protruding portion 702, the shape mounted on the body unit 6 becomes compact.

Next, the configuration of the electric circuit of the body unit 1 and the lens unit in the camera systems of the first and second embodiments and the processing of the photographing sequence will be described. FIG. 17 shows the body unit 1 shown in FIG.
FIG. 4 is a block diagram of an electric circuit of the body unit 1 and the fixed lens unit 3 when the fixed lens unit 3 with a TTL finder shown in FIG. 3 is combined among the lens units. The electric circuit of the body unit is a photosensitive film 1 as a photographing medium shown in FIG.
An electric circuit in the case where the body unit 1A to which No. 26 is applied is combined will be described. It is necessary to change the body unit 1B to which the image sensor 140 is applied as a photographing medium so that the control related to the feeding of the film 126 is not performed and the control instead of the image pickup process of the image sensor 140 is performed. is there.

Electric Circuit 3-10 of Fixed Lens Unit 3
0 (including the control circuit 132 in FIG. 5) and the body unit 1
The electric circuit 1-100 (including the control circuit 327 in FIG. 11) has contacts 1-911, 1-
912, 1-913, 1-914, 1-915 (the pin contacts 191 of the communication contact portion 109 in FIG. 5).

The contact 1-911 is a contact for transmitting data from the fixed lens unit 3 to the body unit 1. The contact 1-912 is a contact for transmitting data from the body unit 1 to the lens unit 3. Contact 1-913
Is a clock transmission contact from the lens unit 3 to the body unit 1. The contact 1-914 is a power supply contact between the body and the lens. The contact 1-915 is a common ground contact between the lens unit 3 and the body unit 1.

The communication between the lens unit 3 and the body unit 1 is such that data is transmitted from the lens unit 3 side to the body unit 1 via the contact 1-911 in synchronization with the clock signal of the contact 1-913. Data is transmitted from the first side to the lens unit 3 via the contact point 1-912. The mutual control members are controlled by the data content and timing of this data communication. It should be noted that the clock signal may be transmitted from the body unit 1 or the number of signal lines and contacts for data transmission and reception may be one. In addition, data transmission and reception may be asynchronous without using a clock signal. Note that the communication means is not limited to the pin contact type, and wireless communication means such as optical communication or electromagnetic wave communication may be applied.

The body unit 1 has a built-in battery 1-116 (battery 124 in FIG. 5), and the lens unit 3 has a built-in battery 3-116 (battery 352 in FIG. 11). The battery output of the lens unit 3 includes a diode 3-115.
Is connected, and the output side of the diode is connected to a power contact 1-.
914 and to the circuit power supply VCCL in the lens unit 3. On the other hand, a diode 1-115 is connected to the battery output of the body unit 1, and the output side of the diode is connected to the power contact 1-914 and to the circuit power supply VCCB in the body unit 1. I have.

Since the power supply is connected as described above, the circuit power supply in the lens unit 3 can be supplied also from the battery 1-116 on the body unit side. , Can also be supplied from the lens unit side battery 3-116.

Therefore, even when the voltage of the lens battery 3-116 drops or the battery on the lens side is not mounted, the lens circuit and the motor can operate, and the voltage of the body battery 1-116 can be further reduced. Even if the battery power drops or the body side battery is not loaded, the circuit and the motor of the body can operate. In addition, power can be provided to a small lens unit that does not include a battery. In addition, the battery consumption of each battery is reduced, and long-term shooting is possible.

Next, the electric circuit 3- on the lens unit 3 side
100 will be described in detail. Control of each circuit element inside the lens unit, including communication with the body unit 1,
The lens CP which is a CPU built in the lens unit 3
This is performed by U3-120. Communication contacts 1-911, 912, and 913 are connected to the lens CPU 3-120. A clock signal terminal (L
CLK) is normally in the input mode, and when the lens unit requests transmission or reception of data, it is in the output mode and outputs a clock signal.

When requesting data transmission from the body unit 1 at the time of operation of the release button or the like, a clock signal and data are output from the body unit and the lens C is output.
A data reception interrupt is issued to the PU 3-120.

The lens CPU 3-120 includes switches 3-103, 3 for reading operation members such as a zoom button.
−104 is connected, and control of the zoom motor and the like is performed according to the operation of the switch. The lens CPU
Is connected to a focus detection sensor 3-101 (focus detection sensor 332 in FIG. 11) and a photometry sensor 3-102 (photometry sensor 330 in FIG. 11), and A / D-converts an output of the sensor to focus the subject. Find the state and distance, and
The subject brightness is determined. And the lens CPU
Controls a focus drive motor according to a focus state and a subject distance to drive a focus lens to a focus position. Further, an aperture drive motor is controlled according to the luminance of the subject, and the aperture is controlled so as to obtain an appropriate exposure.

A motor driver 3-109 is connected to the lens CPU 3-120. The motor driver includes an aperture driving motor 3-105 (an aperture driving member 323 in FIG. 11) and a focus driving motor 3-106. (Figure 1
1, the focus motor 321), the zoom drive motor 3-107 (the zoom motor 326 in FIG. 11), and the mirror drive motor 3-108 (the mirror drive member 3 in FIG. 11).
28) are connected, and drive control of each motor is performed.

Further, a strobe light emission control circuit 3-111 and a strobe capacitor charging circuit 3-113 are connected to the lens CPU 3-120. When the CPU permits the charging circuit 3-113 to charge with the STCHG signal, the capacitor 3-112 is charged to a high voltage. When the CPU permits the light emission control circuit 3-111 to emit light by the STON signal, the strobe light emitting tube 3-110 (the strobe light emitting tube 351 in FIG. 11) emits light.

Further, the CPU operates as a light emission control circuit 3-11.
When the light emission is inhibited for 1 by the STSTP signal, the light emission of the strobe light emitting tube 3-110 is stopped. Further, the STON signal line which is a light emission start signal is connected to a light emission start signal terminal 361 of the external strobe, and the STSTP signal line which is a light emission stop signal is connected to a light emission stop signal terminal 362 of the external strobe. Similarly, the external strobe is controlled to start and stop light emission by the lens CPU.

When the release button 106 (see FIG. 1) of the body unit 1 is operated, the lens CPU 3-120 receives the communication signal and receives the communication signal from the mirror drive motor 3-120.
By controlling 108, the main mirror 334 (see FIG. 11) is retracted outside the optical path for photographing, and is returned to the original position at the end of the exposure.

The electric circuit applied to the other fixed lens units 2 and 2A or the intermediate lens unit 4 or the lens unit 7 is also based on the electric circuit 3-100 of the lens unit 3. Can be designed. That is, a circuit obtained by removing the zoom drive motor and the mirror drive motor from the above-described electric circuit 3-100 may be applied to the electric circuit of the fixed lens unit 2 in FIG. The electric circuit of the lens side intermediate unit 4 in FIG. 12 includes a focus drive motor, a zoom drive motor,
A circuit excluding a strobe light emitting tube and a strobe condenser may be applied.

Further, a circuit excluding the zoom drive motor may be applied to the electric circuit of the lens unit 2A in FIG. The circuit excluding the zoom driving motor, the mirror driving motor, the photometric sensor, the strobe light emitting tube, and the strobe condenser may be applied to the electric circuit of the interchangeable lens unit 7 in FIG.

As described above, no matter which electric circuit is used, the number of electric components is reduced from the electric circuit 3-100 of the lens unit 3, so that the circuit scale is further reduced. Therefore, the electric circuit 3-100 can be, of course, incorporated in the lens unit or the lens-side intermediate unit, as well as electric circuits modified for another lens unit.

Further, those electric circuits are shown in FIGS.
1, 12, 13, and 15, each lens unit 2,
As shown by 3, 4, 2A and 7, since each unit main body can be accommodated in the bottom or center thereof, when mounted on the body unit 1, their electric circuit parts are opened in the opening or mount part of the body unit. Can be stored.

Next, the electric circuit 1-100 on the body unit 1 side to which the fixed lens unit 3 is mounted will be described in detail. Control of each circuit element inside the body unit including communication with the lens unit 3 in the electric circuit 1-100 is performed by a body CPU 1-100, which is a CPU incorporated in the body unit 1.

Communication contacts 1-911, 1-912 and 1-913 are connected to the body CPU 1-100. The state of the clock signal terminal (BCLK) connected to the contact 1-913 is normally in the input mode, and a clock signal can be input from the lens unit 3 side. When requesting data transmission from the body unit 1 such as when operating the release button 106 (see FIG. 1), the state is set to the output mode at the BCLK terminal, and a clock signal and data are output from the body unit side. .

The body CPU 1-100 has a switch 1 which is turned on at the first stage of operation of the release button 106 (see FIG. 1).
-101, a switch 1-102 that is turned on at the second stage of the release button operation, and switches 1-103 and 1-104 that are linked to a shooting mode operation member 116 (see FIG. 1) are connected. , Sequence motor 1-1
05 (sequence motor 123 in FIG. 5), a motor driver 1-106, a photo interrupter 1-113 for detecting the film feeding state, and a shutter front curtain running start magnet (front curtain magnet) 1-108. , Magnet for starting the rear curtain of the shutter (rear curtain magnet) 1
-109, a magnet driver 1-110 for driving -109;
Magnetic writing head 1 for recording shooting information on film
-111 and a display element 1-112 such as an LCD are connected.

The body CPU 1-100 drives the sequence motor 1-105 via the motor driver 1-106 according to the operation of the switch, or
The magnet 1 through the magnet driver 1-110
By driving 108 and 1-109, shutter control, film feeding control, and the like are performed. That is, at the start of exposure, the front curtain magnet 1-108 is turned off to start running the front curtain of the shutter, and after the exposure time has elapsed, the rear curtain magnet 1-109 is turned off to start running the rear curtain of the shutter.
At the end of the exposure, the sequence motor 1-105 is controlled to perform shutter charging and film winding, and rewind the film after shooting the last frame.

The body CPU 1-100 detects the feeding state of the film by the photo interrupter 1-113, and detects the interval of one frame of the film or the last frame based on the detection result. I do. In addition, photographing data and the like are written on a magnetic track on the film when the film is fed by the magnetic writing head 1-111. Further, a photographing mode, the number of photographed frames, a shutter speed, an aperture value, and the like are displayed on a display element 1-112 such as an LCD.

The photographing sequence processing by the electric circuit of the body unit 1 and the fixed lens unit 3 in the camera system configured as described above will be described with reference to FIGS.
1 will be described. FIG.
"Lens control" by the lens CPU 3-120 shown in FIG.
It is a flowchart of a process. FIG. 19 is a flowchart of a subroutine "lens release control" process called in the "lens control" process of FIG.

In the “lens control” process of FIG. 18, when the lens CPU starts operating, a step (process) S1 is performed.
It is determined whether or not the zoom button switch has been operated, and if the switch has been operated, the process proceeds to step S2,
The zoom motor is driven to perform zooming control of the photographing lens, and the process proceeds to step S3.

In step S3, the body-side data transmitted from the body CPU is received. The body-side data is data relating to a release button of the body unit 1, a setting state of a shooting mode, a shutter speed set value, and the like.

In step S4, it is determined whether or not the second-stage switch of the release button is turned on in the body side data. If the switch is turned on, the flow proceeds to step S5 to call a subroutine "lens release control" process described later. It is.
If it is not on, the process proceeds to step S6. When the release button of the body unit 1 is operated, a clock signal is output from the body CPU and the body-side data is transmitted, so that an LCLK interrupt (reception interrupt) is generated in the lens CPU 3 and any operation is performed. Even in the state, the process proceeds to step S4.

In step S6, it is determined whether or not the first-stage switch of the release button is on based on the body side data. If it is on, the process proceeds to step S7, and if not, the process proceeds to step S9. I do.

In step S7, the output of the focus detection sensor is A / D converted to determine the subject distance. In step S8, the focus control of the photographing lens is performed based on the distance information, and the flow advances to step S9.

In step S9, the output of the photometric sensor is subjected to A / D conversion to obtain the subject brightness. In step S10, it is determined whether or not the subject brightness is lower than a predetermined brightness. If the brightness is low, the process proceeds to step S11, and charging of the strobe capacitor is permitted using the STCHG signal. If the brightness is not low, the process proceeds to step S12, and charging of the strobe capacitor is prohibited.

In step S13, an exposure calculation is performed based on the brightness of the subject, the shooting mode, and the like, and the shutter speed and the aperture value during shooting are calculated. In step S14, the exposure information such as the shutter speed and the aperture value obtained by the exposure calculation is transmitted to the body CPU. Thereafter, the process returns to step S1, and the above processing is repeated, so that the shutter speed and the aperture value are constantly updated.

Next, the subroutine "lens release control" called at step S5 will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. The lens release control controls each member from the start to the end of exposure in the lens unit 3. First, in step S101, mirror-up control is performed to retract the main mirror out of the imaging optical path. In step S102, the aperture is narrowed down. The aperture value at this time is adjusted to the aperture value obtained in step S13 (see FIG. 18).

In step S103, the fact that the preparation for photographing such as mirror-up and aperture-down is completed is transmitted to the body CPU. In step S104, the clock signal LCLK
Wait until the signal reaches the L (LOW) level. As described above, the LCLK terminal, which is a clock signal terminal, is in the input mode during non-communication. As will be described later, the body CPU outputs an L signal as a clock signal when the front curtain of the shutter has finished running, and outputs an H (high) signal as a clock signal when the rear curtain of the shutter has finished running. Therefore, step S104 is waiting for the end of travel of the shutter front curtain.

In step S105, the aforementioned step S
10 (see FIG. 18), it is determined whether the subject has low brightness. If the brightness is low, the process proceeds to step S106. If not, the process proceeds to step S109.

In step S106, light emission of the strobe is started by the STON signal. In step S107, after elapse of a time corresponding to the guide number (light emission amount), the process proceeds to step S108, in which the STSTP signal is output to stop light emission. . The flash emission amount may be obtained by the exposure calculation in step S13 (see FIG. 18) described above, or may be obtained based on the distance measurement information in step S7 (see FIG. 18). Further, the light emission may be stopped based on the reflected light from the film.

At the step S109, the clock signal (LC
Wait until LK) becomes H level. Since the LCLK signal outputs the H signal as the clock signal when the rear curtain of the shutter has finished traveling, the step S109 is waiting for the completion of traveling of the rear curtain of the shutter.

In step S110, the aperture is opened, and in step S111, the mirror is returned to the original position by the mirror down control. In step S112, a signal indicating that the return control such as the opening of the aperture and the mirror down has been completed is transmitted to the body.

In step S10 (FIG. 18) and step S105, it is determined whether the brightness is low. However, it may be determined whether the shutter speed is lower than the time when the shutter is fully opened. If the mode is the daytime sync mode, it may be determined whether the mode is set to that mode. Further, in the above-described processing, the mirror-up control and the narrowing-down control are performed as separate processing, but both controls can be performed in parallel.
Similarly, the mirror down control and the aperture opening control can be performed in parallel.

The processing of the lens CPU in the fixed lens units 2 and 2A other than the fixed lens unit 3 or the lens-side intermediate unit 4 is described in FIGS.
9 can be changed and designed. For example, in the case of the fixed lens unit 2 in FIG. 9, the processing except for the zoom control and the mirror control may be performed. In the case of the lens-side intermediate unit 4 in FIG. 12, the processing may be such that focus control, zoom control, and strobe control are removed.
In the case of the lens unit 2A shown in FIG. 13, the processing may be performed without the zoom control. Further, in the case of the lens unit 7 shown in FIG. 15, the processing excluding zoom control, mirror control, photometry / exposure calculation, and flash control may be performed. In step S14 in FIG. 18, focus detection information (focusing / non-focusing information) may be transmitted to the body together with the transmission of the exposure information to the body.

Next, in the photographing sequence processing in this camera system, the body CPU 1 of the body unit 1
Control by −100 will be described. FIG.
"Body control" by the body CPU 1-100 shown in FIG.
It is a flowchart of a process. FIG. 21 is a flowchart of a subroutine "body release control" process called in the "body control" process of FIG.

In the "body control" process of FIG. 20, when the body CPU starts operating, first, in step S20
The state of the release button or the switch of the shooting mode setting member is detected. In step S21, it is determined whether or not the second-stage switch of the release button is on. If it is on, the process proceeds to step S22, and a subroutine "body release control" described later is called. If it is not turned on, the process moves to step S23.

In step S23, it is determined whether or not the first-stage switch of the release button is on. If it is on, the process proceeds to step S24. If not, the process proceeds to step S27.

In step S24, the clock signal terminal (B
CLK) is set to the output mode, and body-side data indicating that the first-stage switch of the release button is ON is transmitted to the lens CPU in step S25. Further, the state of the BCLK terminal is returned to the input mode in step S26, and the process proceeds to step S29. With the clock signal output accompanying the data transmission in step S25, the lens C
An LCLK interrupt to the PU occurs.

At the step S27, the clock signal terminal (B
CLK) is input. That is, the lens CP
From U, it waits until the body side data reception communication is performed in step S3 (see FIG. 18). If there is an input to the BCLK terminal, the flow shifts to step S28 to transmit body-side data such as a set value of the shooting mode and a set value of the shutter speed.

At the step S29, the clock signal (BCL)
Wait until there is an input to K). That is, the lens CPU
Then, the process waits until the exposure information communication to the body side is performed in step S14 (see FIG. 18). If there is an input to the BCLK terminal, the process shifts to step S30 to receive a shutter speed value and an aperture value from the lens CPU, and then to step S31.
To display those values. After step S31, the process returns to step S20.

Next, the subroutine "body release control" processing called in step S22 will be described with reference to the flowchart in FIG. The body release control controls each member in the body unit 1 from the start to the end of exposure. First, in step S201, the state of the BCLK terminal is set to the output mode, and in step S2
02, body-side data indicating that the second-stage switch of the release button is on is transmitted to the lens CPU, and step S
At 203, the state of the BCLK terminal is returned to the input mode.

In step S204, step S1 is executed.
At 03 (see FIG. 19), the camera waits for the body to receive an exposure preparation completion signal from the lens CPU. That is, it waits until the mirror-up and aperture stop in the lens unit 3 are completed.

Then, in step S205, the state of the BCLK terminal is set to the output mode, and in step S206, the shutter front curtain magnet is turned off to start running the front curtain. In step S207, counting of a shutter timer corresponding to the shutter speed is started.

In step S208, it is determined whether the counting of the shutter timer has ended. If not, the flow shifts to step S209 to determine whether the running of the shutter first curtain has been completed. If the front curtain has completed traveling, step S210
And the BCLK terminal is set to L level. When the counting of the shutter timer ends, the process proceeds to step S211.

In step S211, the rear curtain magnet of the shutter is turned off to start traveling of the rear curtain. In step S212, it is determined whether or not the rear curtain has completed traveling. If the traveling has not been completed, the process proceeds to step S213, and if completed, the process proceeds to step S215. In step S213, it is determined whether or not the traveling of the shutter front curtain has been completed. If the first curtain has been completed, the process proceeds to step S214,
The CLK terminal is set to L level, and the process returns to step S212.
If the traveling has not been completed, the process directly returns to step S212. When the process proceeds to step S215, the BCLK terminal is set to the H level, and the process proceeds to step S216.

In step S216, the BCLK terminal is returned to the input mode, shutter charge control is performed in step S217, and film winding control is performed in step S218. In step S219, step S112 (FIG. 1)
9), and waits until the body receives a signal indicating that the return control such as opening the aperture and lowering the mirror from the lens has been completed.

Although the shutter charging and the winding are performed separately in the above-mentioned processing, the shutter charging and the winding can be performed simultaneously by changing the motor driving mechanism or applying an independent motor. Also, although the process of rewinding and magnetic data writing is not shown, if the rewinding is not completed within a predetermined time, the process of starting rewinding, or the rewinding is started when the rewind button is operated. The process of writing magnetic data during winding or writing magnetic data during rewinding can be controlled by well-known techniques, and can be incorporated in the above-described process. is there.

(Supplementary Note) Based on each of the above embodiments,
A camera or a camera system having the following configuration can be obtained. That is, (1) a body unit that holds an imaging medium so as to be able to image and has an opening provided on a front surface of the imaging medium, an imaging lens that forms an image on the imaging medium, a finder device, and a state of focus detection And a driving unit for driving the imaging lens to a focus adjustment position based on the detected in-focus state, and a unit for guiding a light beam from the imaging lens to a finder device and the detection unit. A second lens unit configured such that when mounted on the body unit, at least one of the means other than the imaging lens and the finder device fits in an opening of the body unit. And the camera.

(2) The camera according to appendix 1, wherein the detection means includes a focus detection optical system, a focus detection sensor, and a circuit for reading an output from the focus detection sensor.

(3) A body unit which holds an image pickup medium so as to be capable of picking up an image and has an opening provided on the front surface of the image pickup medium; an interchangeable lens unit having an image pickup lens for forming an image on the image pickup medium; And a finder device, which is provided between the body unit and the interchangeable lens unit, is provided between the body unit and the interchangeable lens unit, detects a focused state, and the imaging lens. And a finder unit configured to guide a light beam from the finder to the finder device and the detection unit, and to be fitted into an opening of the body unit when the finder device is mounted on the body unit. And camera system.

(4) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit has an opening, and the lens unit includes a focus detection device including a focus detection optical system, a focus detection sensor, and an output readout circuit of the sensor, and the lens unit is mounted on the body unit. In
A camera system, wherein a part or all of the focus detection device provided in the lens unit is accommodated inside an opening of the body unit.

(5) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and detachable from the body unit, the body unit is used for mounting the lens unit. An opening portion, wherein the lens unit includes a photographic lens driving device, and when the lens unit is mounted on the body unit, a part or all of the photographic lens driving device provided in the lens unit. But,
A camera system that fits inside the opening of the body unit.

(6) In a camera system having a body unit for holding a photographing medium and a movable unit having a movable mirror and being detachable from the body unit, the body unit is used for mounting the exchange unit. The replacement unit has an opening, the replacement unit includes a movable mirror control device including an actuator for driving the movable mirror and a control circuit of the actuator, and when the replacement unit is mounted on the body unit, A camera system, wherein a part or all of the movable mirror control device provided in the exchange unit fits inside an opening of the body unit.

(7) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit has an opening, and the lens unit includes a photometric device including a photometric optical system, a photometric sensor, and an output reading circuit of the sensor, and when the lens unit is attached to the body unit, A camera system, wherein a part or all of the photometric device provided in a lens unit fits inside an opening of the body unit.

(8) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and being detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit has an opening, the lens unit includes a finder optical system, and when the lens unit is mounted on the body unit, a part or all of the finder optical system included in the lens unit is provided. A camera system that fits inside the opening of the body unit.

(9) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and being detachably mountable on the body unit, the body unit is used for a device of the lens unit. The lens unit has an opening of
An artificial light illumination device comprising an artificial light illumination optical system and a power supply for the light source, wherein when the lens unit is mounted on the body unit, the artificial light illumination device provided in the lens unit A camera system, wherein a part or the whole of the camera unit fits inside the opening of the body unit.

(10) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and being detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit has an opening, and the lens unit includes an actuator such as a motor or a magnet. When the lens unit is mounted on the body unit, a part or all of the actuator included in the lens unit is provided. Is fitted inside the opening of the body unit.

(11) In a camera system having a body unit for holding a photographing medium and a mount for an interchangeable lens and comprising a lens-side intermediate unit detachable from the body unit, the body unit is: The lens-side intermediate unit has an opening for mounting the lens-side intermediate unit, the lens-side intermediate unit includes a focus detection device including a focus detection optical system, a focus detection sensor, and an output reading circuit of the sensor. When the lens-side intermediate unit is mounted on the body unit, part or all of the focus detection device provided in the lens-side intermediate unit fits inside the opening of the body unit. Camera system.

(12) In a camera system having a body unit for holding a photographing medium and a lens unit having a photographing lens and being detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit includes a power supply battery, and when the lens unit is mounted on the body unit, part or all of the battery included in the lens unit is A camera system that fits inside the opening of the body unit.

(13) In a camera system including a body unit that holds a photographing medium and a lens unit that has a photographing lens and is detachable from the body unit, the body unit is used for mounting the lens unit. The lens unit has an opening, and the lens unit includes an electric circuit, and when the lens unit is mounted on the body unit, a part or all of the electric circuit included in the lens unit is connected to the body. A camera system that fits inside the opening of the unit.

(14) In a camera system including a body unit for holding a photographing medium and an exchange unit having a communication contact and detachable from the body unit, the body unit is used for mounting the exchange unit. Opening, and a communication contact with the replacement unit inside the opening, wherein the replacement unit contacts the communication contact of the body unit, and performs signal processing via the communication contact. When the exchange unit is mounted on the body unit, a part or all of the communication device included in the exchange unit is opened by the opening of the body unit. A camera system that fits inside a unit.

(15) In a camera system including a body unit for holding a photographing medium and a lens unit having a photographing lens and being detachably mounted on the body unit by sliding in a straight line, the body unit is An opening for mounting the lens unit, a slide fitting portion inside the opening and parallel to the surface of the photographing medium, wherein the lens unit has a slide fitting portion perpendicular to the optical axis of the photographing lens. When the lens unit is mounted on the body unit, the slide fitting portion of the lens unit fits inside the opening of the body unit, and the optical axis of the photographing lens is photographed. A camera system which is held vertically to a medium.

(16) In a camera system having a body unit for holding a photographing medium and a mount for an interchangeable lens and comprising a lens-side intermediate unit detachable from the body unit, the body unit is a lens It has an opening for mounting the side intermediate unit,
The lens-side intermediate unit includes an interlocking mechanism that controls opening and closing of the diaphragm in the interchangeable lens, and an actuator that drives the interlocking mechanism. When the lens-side intermediate unit is mounted on the body unit, A camera system, wherein the actuator of the lens-side intermediate unit fits inside an opening of the body unit.

(17) In a camera system including a body unit for holding a photographing medium and an exchange unit which has an external strobe control terminal and is detachable from the body unit, the body unit is used for mounting the exchange unit. The exchange unit has a signal generation circuit for outputting at least one signal of strobe light emission start or stop from the external strobe control terminal, and the body unit includes the signal generation circuit. When the replacement unit is mounted, a part or all of the strobe signal generation circuit provided in the replacement unit is
A camera system that fits inside the opening of the body unit.

[0180]

As described above, according to the camera of the first or second aspect of the present invention, when the lens unit is mounted on the body unit, the focus adjustment means of the lens unit fits in the opening of the body unit. Operability is not sacrificed, and the overall balance of the camera in the mounted state is improved. Further, since a plurality of lens units having different photographing lens characteristics can be incorporated with a focus adjusting unit that performs focus adjustment according to each photographing lens characteristic, a camera with high AF accuracy adapted to each photographing lens can be provided. Can be provided.

According to the camera system of the third aspect of the present invention, the first lens unit or the second lens unit can be selectively mounted on the body unit. The focus adjustment means and the like can be accommodated in the opening of the body unit regardless of which lens unit is attached, so that the camera system is well-balanced and easy to use. Can be provided. Further, the first and second lens units can incorporate a photographing optical system and a focus adjusting means or the like according to the purpose of photographing. Can be made to correspond.

[Brief description of the drawings]

FIG. 1 is a perspective view of a body unit constituting a camera system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a fixed lens unit with a range finder constituting the camera system of FIG. 1;

FIG. 3 is a perspective view of a fixed lens unit with a TTL finder constituting the camera system of FIG. 1;

FIG. 4 is a perspective view of a lens-side intermediate unit with a TTL finder and an interchangeable lens that constitute the camera system of FIG. 1;

FIG. 5 is a cross-sectional view of the body unit of FIG. 1, showing the body unit to which a photosensitive film is applied as a photographing medium.

FIG. 6 is a cross-sectional view of the body unit of FIG. 1, showing the body unit to which an image sensor is applied as a photographing medium.

FIG. 7 is a longitudinal sectional view around a lens unit locking member of the body unit in the camera system of FIG. 1;
FIG. 7A shows a state in which the lens unit is being mounted, and FIG.
(B) shows a state in which the mounting of the lens unit is completed.

FIG. 8 is a longitudinal sectional view around a communication contact portion of a body unit in the camera system of FIG. 1;

9 is a longitudinal sectional view showing an internal arrangement when the fixed lens unit of FIG. 2 is mounted on the body unit in the camera system of FIG.

FIG. 10 is a cross-sectional view around the finder portion of the fixed lens unit of FIG. 2 in the camera system of FIG. 1;

11 is a longitudinal sectional view showing an internal arrangement when the fixed lens unit of FIG. 3 is mounted on the body unit in the camera system of FIG. 1;

12 is a vertical sectional view showing an internal arrangement of the camera system of FIG. 1 in a state where the lens-side intermediate unit of FIG. 4 is mounted on a body unit and an interchangeable lens is about to be mounted on the lens-side intermediate unit.

FIG. 13 is a longitudinal sectional view showing an internal arrangement of a modified example of the fixed lens unit in FIG. 2 with a body unit mounted.

FIG. 14 is a perspective view of a camera system according to a second embodiment of the present invention, in which a body unit and a lens unit are not mounted.

FIG. 15 is a longitudinal sectional view showing an internal arrangement of the camera system of FIG. 14 with the lens unit mounted on the body unit.

FIG. 16 is a view of the lens unit of FIG. 15 as viewed from the rear side.

FIG. 17 is a block diagram of an electric circuit of the body unit of FIG. 1 and the fixed lens unit of FIG. 2;

FIG. 18 is a flowchart of “lens control” processing by the lens CPU of the electric circuit of FIG. 17;

FIG. 19 is a flowchart of a subroutine “lens release control” called during the “lens control” of FIG. 18;

FIG. 20 is a flowchart of “body control” processing by the body CPU of the electric circuit of FIG. 17;

FIG. 21 is a flowchart of a subroutine “body release control” process called during the “body control” process of FIG. 20;

[Explanation of symbols]

1, 1A, 1B, 6 ... body unit 2, 2A ... fixed lens unit with rangefinder (lens unit, first lens unit) 3 ... fixed lens unit with TTL viewfinder (lens unit, second lens unit) 4 ... Lens-side intermediate unit with TTL finder (lens unit, second lens unit) 7: Fixed lens unit (lens unit) 111: Opening of body unit 201, 301, 501, 701: Photo-taking lens 221, 320, 705: Drive Gear parts (focus adjustment means) 223, 321, 706: Focus motor (focus adjustment means) 244, 332, 426, 708: Focus detection sensors (focus state detection means) 309, 409 (finder device) 319: Focus lens (taking lens) 3 4 ... zoom lens (taking lens) 334,427 ... main mirror (light guide means) 607 ... mount (opening of the body unit)

Claims (3)

[Claims] An imaging lens configured to form an image of a subject on the imaging medium; A lens unit having at least focus adjustment means for performing focus adjustment in accordance with the subject distance, and a lens unit configured such that the focus adjustment means fits into an opening of the body unit when mounted on the body unit. A camera characterized by comprising: 2. The camera according to claim 1, wherein said focus adjustment means includes a focus detection optical system, a focus detection sensor, and a circuit for reading an output from said focus detection sensor. 3. A body unit for holding an image-capturing medium so that an image can be taken, a body unit having an opening provided on a front surface of the image-capturing medium, an image-capturing lens for forming an image on the image-capturing medium, and the image-capturing lens according to a focused state. A first lens unit having at least focus adjustment means for performing focus adjustment, wherein the first lens unit is configured such that the focus adjustment means fits into an opening of the body unit when mounted on the body unit; A photographing lens for forming a subject image on a medium, a finder device, a detecting unit for detecting a focused state, a focus adjusting unit for performing focus adjustment based on the detected focused state, and a light beam from the imaging lens And a light guiding means for guiding the light to the finder device and the detection means, and when mounted on the body unit, a small number of the above means other than the imaging lens and the finder device. And a second lens unit, at least one of which is configured to fit in an opening of the body unit, wherein the first lens unit or the second lens unit is selected for the body unit. A camera system characterized in that it can be combined in a specific way.