JPH0395535A - Camera with exchangeable photographic optical unit - Google Patents

Abstract

PURPOSE:To display optimum finder information for the unit, always in a correct direction even when the photographic optical unit of a different optical system is mounted by providing a light emitting body or a light guiding member on the camera main body side, and providing a display mask or a liquid crystal display on the photographic optical unit side. CONSTITUTION:In a camera in which the photographic optical unit 21 of the SLR type is mounted on the camera main body 1, light from the light emitting body 105 in the camera main body 1 passes through the display mask 104, a prism 102, and a pentagonal prism 101 from the opening part 111 of the camera main body 1 and the opening part 112 of the unit 21; accordingly the display of contents suitable for the photographic optical unit 21 is displayed in the suitable direction in a finder. Even when the photographic optical unit 41 of the range-finder type is mounted on the camera main body 1, light from the light emitting body 105 in the camera main body 1 passes through the opening parts 111 and 112, a display mask 113, and a condenser lens 47; it it then reflected from a half mirror 44 to be made incident on an eyepiece lens 45; accordingly suitable display is performed.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a finder optical system including at least a front plate portion (part of a front cover), that is, a photographing optical unit that is replaceable. It concerns improvements to cameras.

(Background of the Invention) FIG. 1 is an external view of a photographic optical unit according to the present invention and a camera body to which the unit is attached and detached.
1 is the camera body, and although it is not shown in the diagram, it houses the main functions of the camera, such as the film feeding mechanism, shutter and shutter charge mechanism, mirror drive mechanism, exposure control circuit, and AP detection mechanism. . 2 is a release button, 3 is a mode switching member for selecting a shooting mode of the camera, and 4 is a shutter. Reference numerals 5, 6, and 7 are mount members to which photographic optical units are attached, respectively, and the mount member 7 has positioning holes 7a and 7b formed therein. 8 is a signal contact, 9
is a submirror for guiding the focus detection light beam to a focus detection device (not shown). A mirror drive lever 10 moves downward in conjunction with the downward movement of the sub-mirror 9, and returns upward in conjunction with the return of the sub-mirror. Further, 111 is an opening on the side of the camera body, which will be described later.

Reference numeral 21 denotes a photographing optical unit that is detachable from the camera body l, and the photographing optical unit 21 is an SL R type equipped with a TTL finder and an interchangeable lens mount 25.
Additionally, it is provided with a lens attachment/detachment opening button 22, a main mirror flip-up mechanism 23, a main mirror 24 that guides the photographing light beam to the finder, and the like.

Note that 112 is an opening on the unit side, which will be described later.

Reference numeral 41 denotes a rangefinder type photographing optical unit that is detachable from the camera body 1, and includes a finder window 42 for taking in the finder light beam, a photographing lens 43, and the like. Note that 112 is an opening on the unit side, which will be described later, as described above.

Next, the case where the photographing optical unit 21 is attached to the camera body 1 will be explained.

The photographic optical unit 21 and the camera body 1 are connected to the camera body l.
It is connected to the side mount members 5, 6, 7 and the positioning holes 7a, 7b by a photographing optical unit side mount member (not shown) that is connected thereto, and functions as an SLR camera in this state. At this time, the main mirror flip-up function 23 in the photographic optical unit 21 engages with the drive lever 10 on the main body side,
During a release operation, the main mirror 24 is moved upward in conjunction with the sub-mirror 9. In this state, the signal terminal 8 is exposed within the lens mount 25 of the photographic optical unit 21, so that when an interchangeable lens is attached, signals can be transmitted with the lens.

When attaching the rangefinder type photographing optical unit 41 to the main body, the mount members 5, 6, 7 and 7a
, 7b is the same, and in this case, it functions as a rangefinder camera. At this time, the signal terminal 8 is connected to the photographing optical unit 41 and transmits signals for controlling the photographing optical unit 41 and photographing lens 43 as well as controlling the aperture.

Incidentally, in a conventional single-lens reflex camera with an interchangeable finder, information in the finder is displayed as shown in FIG. That is, the camera body has a light emitter 105 such as an LED and a display mask 104 inside the camera body, and when the light emitter 105 shines inside the camera body, the light is displayed on the display (character) mask 1.
04 (the display mask 104 is shown below when viewed from the right), passes through the opening 111 of the camera body 103, the opening 112 on the exchange finder 100 side, and further passes through the prism 102 and the Venta prism 101. As a result, a display as shown in FIG. 4 was displayed in the viewfinder.

Therefore, if the above conventional example (configurations in FIGS. 9(a) and 9(b)) is applied to a camera with an interchangeable photographing optical unit as described above, the combination of the single-lens reflex type photographing optical unit 21 and the camera body 1 will be In the case of a camera consisting of (see Fig. 2), the display is correctly shown as shown in Fig. 4. However, when applied to a camera consisting of a combination of a rangefinder type photographing optical unit 41 and a camera body 1, an appropriate display could not be obtained as will be described later.

Here, FIG. 10 shows an example in which the present invention is applied to a rangefinder type camera consisting of a combination of a photographing optical unit 41 and a camera body 1.

In FIG. 10, 43a and 43b are objective lenses forming a finder optical system, 43c is a reflective surface, 44 is a half mirror, 45 is an eyepiece, 46 is a field frame deposited on the eyepiece 1 lens 45, and 47 is a condenser lens. It is. Also, parts having the same functions as those in FIG. 9 are given the same reference numerals.

In the above configuration, when the light emitting body 105 lights up inside the camera body 1, the light passes through the display mask 104, the opening 11l of the camera body 1, the opening 112 of the photographing optical unit 41, the condenser lens 47, and passes through the half mirror 44. and enters the eyepiece lens 45, and as a result, the first
A display as shown in Figure 1 will be displayed.

In other words, the rangefinder type photographic optical unit 4
1 and the camera body 1, the display direction is not appropriate as shown in FIG. 10 because the number of reflections is different, and the display becomes illegible. In other words, when applied to a camera with interchangeable photographic optical units as shown in Fig. 1, as long as the display mask is on the camera body L side, the number of light reflections will be different, so only one of the photographic optical units (as described above) can be used. In the example, when the photographing optical unit 41) is attached, it will always occur that the image cannot be displayed correctly.

In addition, in cases such as the composition command shown in Figure 10, since the display mask 104 is provided on the camera body l side, the display content does not change even if the photographic optical unit is replaced, and the optimal display content is displayed for each unit. was impossible.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems and to display finder information that is always in the correct orientation and optimal for the unit even when various photographic optical units with different optical systems are installed. To provide a camera with an interchangeable photographic optical unit.

(Features of the Invention) In order to achieve the above object, the present invention provides an information forming means for forming finder information for the unit on the photographing optical unit side, and illuminates the information forming means on the camera body side. The present invention is characterized in that illumination means for displaying the information is provided in the finder, and information forming means having finder information exclusive to the unit is disposed on the photographic optical unit side.

(Embodiment of the Invention) FIGS. 3(a) and 3(b) show a first embodiment of the present invention, and show the main parts of a camera in which a photographing optical unit 21 is attached to a camera body 1. .

The camera body 1 is equipped with a light emitter 105 such as an LED, and is also provided with an opening 111 (see FIG. 1(b)) for guiding the light from the light emitter 105 to the photographing optical unit 21 side. There is. Further, the photographing optical unit 21 is provided with a pentaprism 101, a prism 102, and an opening 112 (see FIG. 1(a)) that takes in the light from the light emitter 105, as well as a display mask for the photographing optical unit. 104
(Figure 3 shows the state of the display mask 104 viewed from the right side of the figure (
b) is shown in the aperture 112 and the prism 10.
It is located between 2.

In reality, the camera body 1 side is provided with two light emitters 105 as described later, but an example is shown in which only one light emitter 105 is used when the photographic optical unit 21 is attached. Therefore, only one is shown in FIG.

In the above configuration, when the light emitting body 105 shines inside the camera body 1, the light is transmitted to the opening 111 of the camera body 1, the opening 112 on the unit 1 side, the display mask 104, and further to the prism 102 and the Venta prism 101. As a result, as shown in FIG. 4, the image is displayed in the viewfinder in an orientation suitable for the photographing optical unit 21 and with suitable content.

5(a) and 5(b) similarly show a first embodiment of the present invention, in which a photographing optical unit 4 is mounted on the camera body 1.
The main parts of the camera equipped with the camera 1 are shown.

The camera body 1 is equipped with two light emitters 105 such as LEDs, and an opening 111 (see FIG.
)) are provided. The photographic optical unit 41 includes a photographic lens 43, a half mirror 44, and an eyepiece lens 4.
5. In addition to the field frame 46 and condensing lens 47 deposited on the eyepiece lens 45, the display mask 1 for the photographing optical unit 41
13 (The state where the display mask 113 is viewed from the right in the figure is shown in the fifth figure.
(shown in Figure (b)) is disposed between the aperture 112 and the condenser lens 47.

In the above configuration, when the light emitting body 105 shines inside the camera body 1, the light passes through the opening 111 of the camera body 1, the opening 112 on the unit side, the display mask 113, and the condensing lens 47, and passes through the 81-degree mirror 44. The light beam is bent by the arrow and enters the eyepiece lens 45, and as a result, as shown in FIG. 6, the image is displayed in the viewfinder in an orientation suitable for the photographing optical unit 41 and with suitable content.

A display will be displayed.

FIG. 7 shows a second embodiment of the present invention, in which parts having the same functions as those in FIG. 3 are given the same reference numerals. The main parts of the camera are shown.

The difference from the first embodiment is that the camera body 1 is equipped with a light guide member 301 that functions as a light emitting body, and the photographic optical unit 21 is equipped with a liquid crystal display 300 that functions as a display mask 104. The point is that

In the above configuration, external light enters from outside the camera and passes through the light guide member 301, the opening 111 of the camera body 1, the opening 112 on the unit side, the liquid crystal display 300, and the prism 1.
02 and the pentaprism 101, and as a result, the photographing optical unit 21 is shown in the finder as shown in FIG.
The content will be displayed in an orientation suitable for the user.

The content displayed on the liquid crystal display 300 is shown at the bottom of FIG. 7 as viewed from the right. It is driven by a circuit.

Note that the photographing optical unit 41 corresponding to the second embodiment
Although the embodiment of the camera consisting of the camera body 1 and the camera body 1 is not shown, the camera body 1 is shown in FIG. 7(a).
As shown in (b), the photographing optical unit 41 is simply provided with the above-mentioned liquid crystal display in an orientation suitable for the unit and displaying suitable content. It is.

According to this embodiment, the light emitting body or light guiding member is provided on the camera body side, and the display mask or liquid crystal display is provided on the photographing optical unit side, so that various photographing optical units with different optical systems can be used. It is possible to display information in the correct direction even in the case of a camera, and to display finder information that is optimal for the unit.

(Correspondence between the invention and the embodiments) In this embodiment, the display masks 104, 113 or the liquid crystal display 300 are used as the information forming means of the present invention, and the light emitting body 105
Alternatively, the light guide member 301 corresponds to the illumination means.

(Effects of the Invention) As explained above, the present invention provides information forming means for forming finder information for the unit on the photographing optical unit side, and illuminates the information forming means on the camera body side. , an illumination means for displaying the information is provided in the viewfinder, and an information forming means having finder information exclusive to the unit is placed on the photographing optical unit side, so that it can be used for various types of photography with different optical systems. Even if the optical unit is attached, it is possible to always display finder information in the correct orientation and optimal for the unit.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a photographing optical unit according to the present invention and a camera body to which the unit is attached, Fig. 2 is a perspective view of the camera when an SLR type photographing optical unit is attached, and Fig. 3 is an SLR type. Figure 4 is a view showing the display inside the viewfinder, and Figure 5 is a diagram showing the configuration of the main parts in the first embodiment of the present invention when a photographing optical unit of the range finder type is installed. A diagram showing the main part configuration in the first embodiment of the present invention in the case of
Figure 6 shows the display in the finder, Figure 7 shows the SL
A diagram showing the main structure of the second embodiment of the present invention when an R-type photographing optical unit is installed, FIG. 8 is a diagram showing the display inside the viewfinder, and FIG. 9 is a conventional viewfinder interchangeable camera. Fig. 10 is a diagram showing an example in which the conventional example shown in Fig. 9 is applied to a camera equipped with a finder type photographing optical unit with an interchangeable photographing optical unit, and Fig. 11 is a diagram showing the conventional example shown in Fig. 9. It is a figure showing the display in a finder. 1...Camera body, 21.41 2...Photographing optical unit, 104...Display mask, 105.
... Luminous body, 113 ... Display mask, 3
00...Liquid crystal display, 301...Light guiding member.

Claims (1)

[Claims] (1) In a camera in which one of a plurality of photographing optical units with different optical systems is attached to the camera body and the photographing optical unit is replaceable, finder information for the unit is stored on the photographing optical unit side. What is claimed is: 1. A camera with an interchangeable photographic optical unit, characterized in that a photographing optical unit is provided with an information forming means, an illumination means is provided on the camera body side for illuminating the information forming means, and for displaying the information in a viewfinder.