JPS60200243A - Camera - Google Patents

Abstract

PURPOSE:To constitute a thick, compact camera by providing the 1st and the 2nd mirrors and a reflection type focal plate, and switching a photographic optical path and a finder optical path through the switching of the 2nd mirror. CONSTITUTION:The 1st mirror 11, the 2nd mirror 12 which can be switched between an oblique and a vertical position, the reflection type focal plate 13, etc., are provided in the camera body 5. When a photography is taken, image light from the photographic lens 1 is reflected by the 1st mirror 11 and then reflected by the 2nd mirror 12 at the oblique position to travel along photographic optical paths (a), (b), and (c) to a film 2. Further, when the light travels through optical paths (a), (b), (d), and (e), the 2nd mirror 12 is switched to the vertical position. Consequently, the thick, compact camera is constituted because this is an erect image type which reflects the image light twice by the 1st and the 2nd mirrors 11 and 12 to secure necessary optical path length.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to an eye-opening camera.

C) In recent years, with the practical use of film units that can be processed by diffusion transfer using diffusion transfer photography, the usefulness of folding cameras has been emphasized.

In other words, due to the nature of this type of film unit, the screen size is unavoidably large, and the camera has to be made larger to ensure the necessary optical path length, so a folding structure is adopted to make the camera more compact. This is because it is preferable to make the camera foldable so that it does not interfere with carrying the camera.

By the way, single-lens reflex cameras for this type of film unit, which have been in practical use for a long time, are for so-called mirror-image type film units, in which a single reflective mirror is placed between the photographing lens and the film exposure surface. However, for so-called normal image type film units in which two reflecting mirrors are placed between the photographing lens and the film exposure surface, the drive and folding structure of the mirrors is complicated. Therefore, despite the high demand for a -eye reflex camera, the current situation is that no proposal has been made yet.

(Object of the Invention) The present invention provides a normal image type film unit H as described above.
The basic objective is to provide a camera that employs a new optical system structure that can be optimally used in F1ll and 7 types of cameras.

(Structure of the Invention) Therefore, the present invention provides a camera in which a photographing lens and a device for loading film with the exposure surface facing rearward are arranged along the front surface of the camera body. A first mirror that reflects the image light passing through the photographic lens, a reflection position where the reflected image light from the first mirror is reflected and projected onto the exposure surface, and a retreat that does not prevent the reflected image light from the first mirror from traveling straight. a second mirror that selectively assumes two positions, a focusing plate at a position conjugate to the exposure surface with respect to the second mirror in the reflecting position, and an optical system for observing image light formed on the focusing plate. It is constructed with a system.

(Effects of the Invention) According to the present invention, the image light of the photographing lens is reflected twice by the first and second mirrors, and is used for a normal image type film unit that projects the image light onto the film exposure surface while ensuring the necessary optical path length. Because it is a shooting optical path, it is possible to configure a thin and compact camera, and it is also a finder optical path that guides the image light to the finder with a focusing plate, but by moving the second mirror, it can be changed between the shooting state and the 7-finder state. The drive structure for the mirrors can be simplified, and since the 7-viewfinder can be placed behind the first mirror, the viewfinder is very easy to see when taking pictures.

(Example) As shown in Figs. 1 to 3, the camera basically has the following features:
A camera body in which a film storage chamber 3 for storing a film 2 with the exposure surface 2a facing backward is formed directly below a photographic lens 1, and a finder storage chamber 4 whose rear side is open is formed directly above the photographic lens 1. 5 is joined to the lower part of the rear opening 6 of the camera body 5 and the link member 7 provided at the upper part of the rear opening 6, and is bent in an inverted shape toward the rear of the camera body 5 to open the rear opening. The back cover can be opened and closed in the open position A (state shown in Figure 2) in which 6 is opened, and the closed position B (state shown in Figure 1) in which it rises in a straight line toward the camera body 5 and closes the rear opening 6. 8, is supported by the link member 7 and the back cover 8 so as to be able to rise and fall, and projects upwardly from the back cover 8 at the open position A of the back cover 8, and descends below the back cover 8 at the closed position B of the back cover 8. Then, the finder 9 stored in the 7-finder storage chamber 4 of the camera body 5 and the rear opening 6 side of the camera body 5,
It is connected to the rear opening 6 so as to cover the rear of the photographic lens 1, the front of the film storage chamber 3, and the periphery of the finder 9, and is provided with a shag 10 that can be folded flat when the back cover 8 is opened and closed. It is structured and constructed.

In addition, as shown in FIG. 3, the camera optical system basically reflects the image light downward with a first mirror 11 at the rear of the photographing surface X: 1, and a second mirror in front of the film exposure surface 2a. 1
2, the reflected image light of the first mirror 11 is transferred to the film exposure surface 2a.
Photographing optical path a.

The reflected image light of the first mirror 11 is reflected to the rear of the first mirror 11 by the reflection focus plate 13 located below the second mirror 12 which has been retracted from the imaging optical paths atb and c, and the first mirror 11
It is configured as a single-lens reflex camera equipped with finder optical paths aeJd and e for reflecting the image light backward through the rear 7fins 9 and guiding it to the eyepiece 14.

As shown in FIG. 4, the camera body 5 is formed in the shape of a flat vertically elongated square box, and a front surface 5a is provided with a photographing opening 5b for the photographing lens 1, and a film storage chamber 3.
A film storage lid 22 for storing a film pack 20 containing a predetermined number of films 2 is provided so as to be openable and closable from the front side 5a. When the film pack 20 is stored in the camera and the film storage lid 22 is closed, the film pack 20 is oriented at a predetermined position by the pressure plate spring 21.

The film 2 is a so-called normal image type diffusion transfer photographic film unit, and after exposure, the built-in processing liquid is spread by a press roller or the like at the bottom of the camera body 5 and sent out to the lower part of the camera body 5. (see FIG. 3) is a known configuration in which an image is formed.

The back cover 8 is divided into upper and lower halves, an upper back cover 8a and a lower front i8b, which fit into the rear opening 6 of the camera body 5.
The lower part of the lower cover 8b is connected to the upper part of the lower front cover 8b by a hinge pin 26, and the lower part of the lower front cover 8b is pivotally attached to the lower part of the rear opening 6 of the camera body 5 by a hinge pin 27. [
The upper part of the lid 8a is provided with a link member 7 whose front end is pivotally connected to the upper part of the rear opening 6 of the camera body 5 with a hinge pin 28.
It is connected to the rear end with a hinge bin 30.

As shown in FIG. 5, the lower end of a back cover support member 31 having a long hole 31a is connected with a pin 32 to the bottom of the back cover 8 and the side of the cover 8b. The elongated hole 31a is fitted into the positioning pin 33 provided on the camera body 5, and when the upper and lower back covers 8a, 81+ are bent backward in an inverted 11 shape to open the rear opening 6 of the camera body 5, long hole 3
The upper end of 1a is abutted by the positioning pin 33, and the upper and lower back covers 8a, 8b are held in the open position A together with the link member 7.

Conversely, when the upper and lower back covers 8a and 8b are raised linearly forward and the rear opening 6 of the camera body 5 is closed, the back cover support member 3
1 is stored in the camera body 5 while the elongated hole 31a is guided by the positioning pin 33, and the link member 7
The upper and lower back covers 8as and 8b are also stored inside the camera body 5.
is now held at the closed position B.

On the other hand, as shown in FIGS. 4 and 5, the first mirror 11 at the rear of the photographing lens 1 is supported by a first holder 36, and the upper part of the first holder 36 is attached to the camera body 5 through a first hinge bin 37. a protruding position that projects diagonally downward to the rear of the camera body 5 and reflects the image light of the photographing lens 1 downward; and a storage position that is retracted downward and almost vertically into the rear opening 6 of the camera body 5. It is designed to be able to oscillate.

The V,2 mirror 12 in front of the film exposure surface 2a is supported by a second holder 38, and the lower part of the second holder 38 is pivotally attached to the camera body 5 by a second hinge pin 39, and the lower part of the second holder 38 is pivoted to the rear of the camera body 5. The first mirror 11 protrudes upward.
The camera body 5 swings between a first position (shooting position) in which reflected image light is projected onto the film exposure surface 2a and a second position (finder position) in which it is retracted upward and almost vertically into the rear opening 6 of the camera body 5. It is now possible to do so.

A reflective focus plate 13 disposed below the second mirror 12 at a position conjugate with the film exposure surface 2a is attached to the inner surface of the lower front cover 8b of the back cover 8, and is located at the opening position fitA of the back cover 8.
The second mirror 12 protrudes diagonally upward to the rear of the camera body 5 and forms an image of the reflected image light of the first mirror 11 instead of the second mirror 12 which has swung to the second position (finder position). It is designed to be able to swing together with the lower front cover 8b into a protruding position where it is reflected toward the rear cover 8b and a storage position where it is stored upward and almost vertically into the rear opening 6 of the camera body 5 when the back cover 8 is closed. .

The finder 9 at the rear of the first mirror 11 is made of a Guhama mirror or a roof prism, and a dogleg-shaped slot 9a on the side is fitted into the pin 40 of the link member 7, and a dogleg-shaped slot 9b on the side. , 9c are the pins 41., 9c of the upper back cover 8a.
42, the link member 7 and the upper back cover 8
a, and the back cover 8 is in the open position A.
, the elongated holes 9a to 9c are guided by pins 40 to 42 and protrude upward from the upper back cover 8a, and reflect the reflected image light reflected by the reflective focus plate 13 backward to form the eyepiece 14.
The elongated holes 9a to 90 are connected to the pin 4 at the protruding position leading to the position and at the closed position of the back cover 8 following the trajectory shown by the two-dot chain line in FIG.
0 to 42, it descends below the upper back cover 8a and can be raised and lowered to a storage position where it is stored in the finder storage chamber 4 of the camera body 5.

On the other hand, as shown in FIG.
A swinging member 45 is provided at the lower part of the holder 38), and at the tip of the swinging member 45, a linking member 4 is guided so as to be movable up and down by a pin 46 provided on the camera body 5.
The lower part of the second mirror 12 is connected by a pin 48, and a coil spring 49 stretched between the pin 48 and the camera body 5 urges the second mirror 12 in the projecting direction.
7 is biased in the Shibetsu direction.

Further, the front part of an eyepiece shutter 50 is pivotally attached to the upper part of the camera body 5 by a hinge pin 51, and the eyepiece shutter 50 is located at a first position where it protrudes rearward of the camera body 5 and closes the entrance surface of the viewfinder 9. , camera body 5
It is configured to be able to swing to a second position in which it is stored downwardly and outwardly substantially vertically into the rear opening 6;1. A swinging member S2 is provided at the front of the eyepiece shutter 50.

A first timing setting cam 53 is brought into contact with the tip of the swinging member 52 of the eyepiece shutter 50, and a second timing setting cam 54 is brought into contact with the upper end of the linking member 47.
are coaxially and integrally rotatably provided on the camera body 5, and the first. Second cam 53.
By one rotation clockwise in the figure of 54 (-photography cycle),
The eyepiece shutter 50 is first positioned at the first position,
Next, there is a photographing state in which the second mirror 12 is located at the first position (the state shown in FIG. 6), and a finder state in which the second mirror 12 is first located at the second position, and then the eyepiece shutter 50 is located at the second position. The state will be swung at a predetermined timing.

Next, returning to FIG. 5, a positioning pin 57 is provided on the side of the second holder 38 of the second mirror 12, and the positioning pin 57 is connected to a positioning member 59 pivotally attached to the camera body 5 by a hinge pin 58. is fitted into the elongated hole 59a of the
The positioning pin 5 of the second mirror 12 is fixed by the coil spring 49.
7 moves through the elongated hole 59a of the positioning member 59 and swings the positioning member 59 upward. Due to the banner effect, the second mirror 12 swings relatively slowly in the protruding direction, and the positioning pin 57 is held against the lower end of the elongated hole 59a, and the second mirror 12 is accurately positioned at the first position with a slight mirror shock, and when the second mirror 12 swings to the second position, the positioning member 59 becomes elongated. While the hole 59a is guided by the positioning pin 57, it is retracted downward into the rear opening 6 of the camera body 5 almost vertically.

Further, at the bottom of the second holder 38 of the second mirror 12,
A detection member 60 is provided, and the lower end of a safety member 62 pivotally attached to the camera body 5 with a pin 61 is connected to the detection member 60.
When the second mirror 12 is in the first position, the upper end of the safety member 62 is faced in front of the upper end of the camera back support member 31 in the retracting direction. On the other hand, the detection pin 61 comes into contact with the safety member 62 and the upper end of the safety member 62 prevents the back cover support member 31 from moving in the storage direction. 2
The mirror 12 is protected.

Furthermore, one end is connected to the side of the lower front cover 8b by a pin 65, the other end is pivotally connected to the above-mentioned pin 61 of the camera body 5, and the center is connected by a connecting pin 66.
67a, 67b) are provided, and the upper link member 67a of the chive-folding link member 67 is provided with a camera body 5.
The lower part of the linking member 69, which is guided so as to be raised and lowered by a pin 68 provided in Eyepiece shutter 50 on 69b
The linking pins 72 are arranged to link with each other, and when the linking member 69 is raised via the chive-folding link member 67 when the back cover 8 is closed, the upper cam surface 69a engages the first holder 36 ( Swinging the first mirror 11) to the storage position,
The eyepiece shutter 50 is moved to the second position on the lower cam surface 691).
It is designed to swing into position.

In addition, in the second position, the swing timing is set so that the first holder 36 and the second holder 38 are stored closest to the film exposure surface 2a, and the eyepiece shutter 50 is stored behind them. A shutter 10 is housed between the shutter 50 and the back cover 8.

The operation of the camera configured as described above will now be described.

(1) Opening the back cover 8 (8a, 8b) Unlock the back cover 8 from the camera body 5, and
When c is pulled rearward, the upper and lower back covers 8a and 8b are bent in an inverted shape by the hinge pins 26 and 27 to open the rear opening 6, and the back cover 8 is engaged with the link member 7 by the back cover support member 31. is held at the open position A.

By opening the back cover 8, the flat folded cover 10 is unfolded, and the elongated hole 9 of the finder 9 is unfolded.
By guiding a to 9c with the bins 40 to 42,
A finder 9 projects above the upper lid 8a.

In addition, a leek folding link member 67 connected to the Emperor lid 8b
As a result, the linking member 69 is lowered, and the first holder 36 (first mirror 11) is swung to the protruding position by the coil spring 74.

Note that the eyepiece shutter 50 and the second holder 38
(Second mirror 12) is swung to the second position (finder position) by first and second timing setting cams 53,54.

(2) Photographing process Initially, the shutter of the photographing lens 1 is open, and when you look into the eyepiece 14 of the finder 9, the image light from the photographing lens 1 is guided to the eyepiece 14 via the 7 viewfinder optical paths a, bld, and e. He can confirm the subject through the eyepiece 14.

When the shutter button is pressed, the shutter is first closed, and the first shutter is activated by the motor. Eyepiece shutter 5 from one half turn of second timing setting cam 53.54
0 and the second mirror 12 are swung to the first position (photographing position) at a predetermined timing, and then the shutter is opened and closed at an appropriate timing, and the image light of the photographing lens 1 is directed to the photographing optical path a.
, 11, C onto the film exposure surface 2a so that the film exposure surface 2a is exposed. Second timing setting cam 53
．． The eyepiece shutter 50 and the second
The mirror 12 is swung to the second position (finder position) at a predetermined timing, and then the shutter is opened and returned to the initial state.

The exposed film 2 is sent out below the camera body 5 while being spread by a press roller or the like as described above.

(3) Closing the back cover 8 (8a, '8b) When the back cover support member 31 is unlocked and the protruding part 8c of the upper cover 8a is pushed forward, the upper and lower back covers 8a, 8b will close with the hinge pin. 2
6.27 rises in a straight line to close the rear opening 6, and the link member 7. The back cover support member 31 is stored within the camera body 5, and the back cover 8 is held in the closed position B.

By closing this back cover 8, the elongated hole 9 of the finder 9 is opened.
By a to 9c being guided by pins 40 to 42.''
It descends below the second back cover 8a and is stored in the finder storage chamber 4 of the camera body 5.

In addition, a leek folding link member 67 connected to the Emperor lid 8b
As a result, the linking member 69 is raised, and the first mirror 11 is swung to the retracted position.

Further, the shabara 10 is folded flat, and the camera body 5 is folded flat.
stored within.

[Brief explanation of the drawing]

Figure 1 is a rear perspective view of the folding camera with the back cover closed. Figure 2 is a rear perspective view of the folding camera with the back cover open.
The figure is a vertical cross-sectional view showing the optical system of the folding camera, Figure 4 is a vertical cross-section of the central part of the folding camera, Figure 5 is a vertical cross-section of the left side of the folding camera, and Figure 6 is the right side of the folding camera. FIG. 1... Shooting lens, 2... Film, 3... Film storage chamber, 5... Camera body, 8 (8a, 8b)
...II, 9...Finder, 10...Kaiyabara, 11...First mirror, 12...Second mirror, 13
...Reflection focus plate, 14...Eyepiece. Patent applicant: Fuji Photo Film Co., Ltd. Agent: Patent attorney: 2 people No. 3B Figure 4 Figure 5

Claims (1)

[Claims] (1) In a camera in which a photographing lens and a device for loading film with the exposure surface facing backward are arranged along the front of the camera body, the device located behind the photographic lens reflects the image light passing through the photographic lens. a first mirror that reflects the reflected image light from the first mirror and projects it onto the exposure surface; and a retracted position that does not prevent the reflected image light from the first mirror from traveling straight.
! a second mirror that selectively takes the position of the second mirror, a focus plate located at the exposure surface and the military service position relative to the second mirror in the reflection position, and an optical system for observing image light formed on the focus plate. A camera characterized by: