JPH11119328A - Film holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make adaptable one main body to all of a necessary number of the screen sizes by selectively and interchangeably attaching one of plural mask plates equipped with apertures whose size is different from each other. SOLUTION: The mask plate 10 is constituted of a frame-like body formed of a thin plastic plate equipped with the aperture 11 at its center part. A solid line 11a shows the outer periphery position of the aperture 11 having the width A1 of the mask plate for 6×7 format, an alternate long and short dash line 11b shows the outer periphery position of the aperture 11 having the width A2 of the mask plate for 6×6 format, and an alternate long and two short dashes line 11c shows the outer periphery position of the aperture 11 having the width A3 of the mask plate for 6×4.5 format. Furthermore, a broken line 3a shows the outer periphery position of the aperture 11 having the width A0 for 6×8 format formed on a film holder main body. The plate mask 10 is provided with a movable engaging pawl 13 whose tip is engaged to the engaging groove of the film holder main body and a fixed engaging pawl 19 engaged to the engaging groove of a film main body lower part overhanging part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film holder, and more particularly, to a film holder which is interchangeably mounted on the back of a camera body.

[0002]

2. Description of the Related Art For example, in a medium-sized or large-sized camera using a 120 (or 220) type roll film, a film holder (or a film back) for loading a film is detachably provided on the back of the camera body. (See, for example, JP-A-62-186240).

[0003]

By the way, in general, the screen size of this type of camera is 6 × 9 size, 6 × 8 size, 6 × 9 size.
There are five types: × 7 size, 6 × 6 size and 6 × 4.5 size.
The screen size is selected by exchanging a film holder provided with an aperture of each size. Therefore, there is a problem that five kinds of film holders must be prepared in order to adapt to all screen sizes.

[0004] In view of the above-mentioned circumstances, an object of the present invention is to provide a film holder that can be adapted to all necessary screen sizes by using a single film holder main body.

[0005]

According to the present invention, there is provided a film holder comprising a plurality of mask plates having apertures having different sizes from each other, and one of the plurality of mask plates.
And a film holder main body configured to be able to selectively and interchangeably mount the two.

In this case, it is preferable that the mask plate and the film holder main body are provided with identification means for identifying the aperture size of the mask plate mounted on the film holder main body.

[0007] The identification means can be constituted by a plurality of electric switches provided on the film holder body and an actuator provided on the mask plate for selectively operating the plurality of electric switches.

Further, among the plurality of mask plates,
It is preferable that a mask plate having an aperture of a minimum size (6 × 4.5 size) includes an actuator for activating all of the plurality of electric switches.

Further, the mask plate is formed of a frame having an aperture at a central portion, and an engaging claw spring-biased in a direction protruding from an outer edge of the frame to the outer edge of the frame. Preferably, it is provided freely.

[0010]

The film holder according to the present invention is configured such that one of a plurality of mask plates provided with apertures having different sizes can be selectively and interchangeably mounted on the film holder body. By preparing a required number of mask plates for one film holder main body, it can be applied to various screen sizes, which is extremely convenient in practical use and has an effect of reducing expenses.

When the mask plate and the film holder main body are provided with means for identifying the aperture size of the mask plate mounted on the film holder main body, the aperture size of the mask plate mounted on the film holder main body is provided. Can be displayed on the display unit of the camera body, or the system of the entire camera can be switched to an operation state corresponding to the aperture size.

In this case, the means for identifying the aperture size of the mask plate is determined by a plurality of electric switches provided on the film holder body and an actuator provided on the mask plate for selectively operating the plurality of electric switches. With this configuration, it is possible to easily configure a reliable operation means.

Since the aperture of the minimum size (6 × 4.5 size) has the minimum size in the film feeding direction, the mask plate having the aperture of the minimum size is used for all of the plurality of electric switches. When the mask plate having the aperture of the minimum size is mounted on the film holder main body, even if the electric switch malfunctions, the film feeding amount is 6 mm. Since it is equal to the feed amount of 6 × 6 or 6 × 7 which is larger than that of × 4.5, the film consumption is slightly increased,
Photographing can be performed without fear of overlapping the screen.

Further, in the case where the engaging claw spring-biased in a direction protruding from the outer edge of the frame-shaped mask plate is provided so as to be able to protrude and retract from the outer edge, the mounting and dismounting of the mask plate with respect to the film holder main body. Can be performed easily and reliably.

[0015]

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

FIG. 1 is a perspective view showing a film holder body of a film holder according to one embodiment of the present invention.

A mounting portion 2 for the camera body is provided in an annular shape on a surface 1a of the film holder main body 1 which is in close contact with the rear surface of the camera body (not shown). An aperture 3 having a size suitable for 8-size is formed.

Overhangs 2a and 2b are formed at the upper and lower positions of the mount 2, respectively. At the center of the lower edge of the upper overhang 2a, a movable engagement claw 13 of a mask plate 10 to be described later engages. A pair of switch buttons 5 are formed in the mating groove 4 and close to the lower edge of the upper protrusion 2a.
A and 5B protrude from both sides of the engagement groove 4.

In the center of the upper edge of the lower overhang 2b,
An engagement groove (not shown) into which a fixed engagement claw 19 of the mask plate 10 described later is engaged is opened. Furthermore, surface 1a
The contact points 6 and 7 for electrically connecting the camera body and the film holder body 1 are provided at the two upper positions.

FIG. 2 is a plan view showing a mask plate 10 detachably mounted on the film holder main body 1 of FIG.
FIG. 3 is a rear view thereof.

The mask plate 10 is formed of a frame formed of a thin plastic plate having an aperture 11 at the center. Three types of mask plates, 6 × 7 size, 6 × 6 size, and 6 × 4.5 size, are prepared. The mask plate 10 shown in FIGS. 2 and 3 is for 6 × 7 size. a mask plate, is shown an outer edge position 11a of the aperture 11 having a width a ₁ in solid lines. Further, the outer edge position of the aperture having the width A ₂ of the mask plate for 6 × 6 size paper 1
1b is indicated by a chain line, 2 an outer edge position 11c of the aperture of the mask plate having a lateral width A ₃ for 6 × 4.5-size
Indicated by the dotted line. Further, there is shown the outer edge position 3a of the aperture 3 with the width A ₀ for 6 × 8 size paper that is formed in the film holder body 1 by a broken line.

FIG. 4 shows the upper frame portion 12 of the mask plate 10.
FIG. 5 is a perspective view, FIG. 6 is a front view thereof, and FIG. 7 is a view taken along line VII-VII of FIG. FIG.

At the center of the outer edge of the upper frame portion 12 of the mask plate 10, a central projecting portion 12a protrudes, and a horizontally long opening 12b is formed behind the central projecting portion 12a. A groove 12c is formed on the bottom surface of the central overhang 12a so as to extend from the front edge of the central overhang 12a to the opening 12b.
A movable engaging claw 13 whose tip can be engaged with the engaging groove 4 of the film holder body 1 is slidably accommodated in the groove 12c. Further, in the opening 12b,
A wide plate-shaped operation knob 14 that is bent at a substantially right angle from the base end of the engagement claw 13 and protrudes from the surface of the upper frame 12 is accommodated. The engagement claw 13 and the operation knob 14 are viewed from the side. It is L-shaped (see FIG. 9). The opening 12b is
The operating knob 14 has a depth dimension that allows the operating knob 14 to be moved backward.

The operating knob 14 is in contact with the front wall surface of the opening 12b by the leaf spring 15 urging the engaging claw 13 in a direction protruding from the front edge of the central projection 12a. In this state, the tip of the movable engagement claw 13 integral with the operation knob 14 protrudes from the front edge of the upper frame 12. Then, by operating the operation knob 14 with a finger against the urging force of the leaf spring 15 and moving the operation knob 14 backward in the opening 12 b, the tip of the engaging claw 13 is inserted from the outer edge of the upper frame 12. Is configured.

The movable engaging claw 13 and the leaf spring 15 integrated with the operation knob 14 are attached from the back side of the upper frame portion 12. After these components are attached, a metal thin plate 16 having a shape as shown in FIG. The movable engagement claw 13 and the leaf spring 15 integrated with the operation knob 14 are held at the operable position by being screwed to the back surface of the upper frame portion 12. Metal sheet 16
A pair of cutouts 16a, 16b are provided at both sides of the central overhanging portion 12a at the front edge of.

On both sides of the center overhanging portion 12a of the upper frame portion 12, overhanging portions 12d and 12e are provided at predetermined intervals from the center overhanging portion 12a, and the overhanging portions 12d and 12e have Central overhang 12a
Is selectively provided as a switch actuator for aperture size identification. FIG.
In the 6 × 7 size mask plate 10 shown in FIGS. 4 to 7, the arm 17 is integrally provided only on the left overhang portion 12e side in FIGS.
The arm on the 2d side is missing. Tip 17 of arm 17
6A and 7A are engaged in the left notch 16b of the sheet metal 16 and are exposed at the bottom surface of the sheet metal 16 as is clear from FIGS.

On the other hand, in the case of the 6 × 6 size mask plate, the aperture size identifying arm 17 is provided only in the right overhanging portion 12 d, as opposed to the 6 × 7 size mask plate 10. Is provided integrally with the arm 17
Of the metal sheet 16 is inserted into the right notch 16a.
And the arm on the side of the left overhang portion 12e is missing. In the case of a 6 × 4.5 mask plate, arms 17 for aperture size identification are integrally provided on both the left and right overhanging portions 12d and 12e, and the tips of the arms 17 and 17 are left and right. Into the notches 16a and 16b of the metal sheet 16 respectively.
It is configured to be exposed on the bottom surface of the.

Further, as shown in FIGS. 1 and 2, an engaging groove (not shown) formed in the lower projecting portion 2b of the film holder main body 1 is formed in the outer edge of the central portion of the lower frame portion 18 of the mask plate 10. ) Are protrudingly provided. The fixed engagement claw 19 is formed to be narrower and thicker than the movable engagement claw 13 described above, thereby preventing the mask plate 10 from being reversely attached.

Next, FIG. 8 is an enlarged plan view of a main part showing a state where the mask plate 10 having the above-mentioned configuration is mounted on the film holder main body 1. FIG. 9 is a sectional view taken along line IX-IX of FIG. It is sectional drawing along.

The mask plate 10 first has its lower frame 1
8 is engaged with the engaging groove formed in the lower projecting portion 2b of the film holder main body 1, and then the operating knob 14 is operated with a finger against the urging force of the leaf spring 15. When the upper frame 12 is overlaid on the film holder main body 1 with the tip of the movable engagement claw 13 immersed from the front edge of the central projection 12a and the finger is released, the movable engagement claw 13 Due to the urging force, the upper projecting portion 2a of the film holder main body 1 is formed.
The mask plate 10 is attached to the film holder main body 1 while being engaged in the engagement groove 4 of FIG. When the mask plate 10 is detached from the film holder main body 1, the operation knob 14 is operated with a finger against the urging force of the leaf spring 15 so that the tip of the movable engagement claw 13 is immersed from the front edge of the central projection 12a. I just need.

The film holder main body 1 is provided with thin electric switches SA and SB which are respectively operated by the above-mentioned pair of left and right switch buttons 5A and 5B, and the mask plate 10 is mounted on the film holder main body 1. Then, as shown in FIG. 10A, when the tip of the right arm 17 of the mask plate 10 presses the switch button 5B, the switch SB is turned on, whereby the signal of (0, 1) is turned on. Is output to the camera body, and the camera body recognizes that the mask plate 10 having the 6 × 7 aperture 11 is mounted.

On the other hand, when a 6 × 6 mask plate is mounted, as shown in FIG.
Since the tip of the left arm 17 of the mask plate presses the switch button 5A, the switch SA is turned on,
As a result, the signal (1, 0) is output to the camera body, and the camera body recognizes that the mask plate having the 6 × 6 aperture has been mounted. Also,
When a 6 × 4.5 size mask plate is mounted, as shown in FIG. 10 (c), the tips of a pair of arms 17, 17 of the mask plate are connected to switch buttons 5A, 5B.
Are pressed, the switches SA and SB are both turned on, whereby the signal of (1, 1) is output to the camera body side, and the mask plate having the 6 × 4.5 aperture is mounted. This is recognized by the camera body.

On the other hand, when neither mask plate is mounted, neither switch button 5A nor switch button 5B is pressed, so that both switches SA and SB remain off, whereby the signal of (0, 0) is output. 6 × 8 output to the camera body side and no mask plate attached
The camera body side recognizes that the camera is in a shooting state of the medium.

On the camera body side, the aperture size (6 × 8 size) when the mask plate is not mounted or the aperture size (6 × 8 size) of the mounted mask plate.
(7 size, 6 × 6 size, 6 × 4.5 size) is displayed on the display unit, and the system of the entire camera can be switched to an operation state according to the aperture size.

As described above, in the film holder according to the present embodiment, the 6 × 7 size, 6 × 6 size, and 6 × 7 size film holder body 1 having the 6 × 8 size aperture 3 are provided.
Since one of three mask plates each having a 4.5-size aperture is configured to be selectively and exchangeably mounted, three types of mask plates are provided for one film holder body 1. Just prepare a mask plate,
The present invention can be applied to four types of screen sizes, is extremely convenient in practical use, and has an effect that the cost can be reduced as compared with the case where four types of film holders are prepared.

The two electric switches SA and SB provided on the film holder main body 1 and the arm 17 provided on the mask plate for selectively operating the two electric switches SA and SB are provided. Since the means for identifying the aperture size of the mask plate mounted on the film holder body 1 is configured, the configuration is simple,
The aperture size of the mask plate attached to the film holder body 1 is displayed on the display unit on the camera body side,
It is possible to automatically switch the entire camera system to an operation state according to the aperture size.

Then, as shown in FIG. 10 (c), a 6 × 4.5 size mask plate having the smallest aperture size in the film feeding direction
By providing a pair of arms 17, 17 for pressing A and 5B, respectively, that is, a mask plate of 6 × 4.5 size having a minimum aperture size is provided with an actuator for activating all electric switches. In the event that a malfunction of one of the switches SA operated by the switch button 5A occurs,
In the same state as (a), the camera body recognizes that the mask plate having the 6 × 7 size aperture is mounted, and the film feed amount is reduced to the 6 × 7 size feed amount. In the case where the operation becomes equal and an operation failure of the other switch SB operated by the switch button 5B occurs, FIG.
In the same state as (b), since the camera body recognizes that the mask plate having the 6 × 6 aperture is mounted, the film feed amount is reduced to the 6 × 6 feed amount. Become equal.

In each case, the film feed amount was 6 ×
Since the size is larger than that of the 4.5-size one, although the film consumption is slightly increased, there is an advantage that the photographing can be performed without the risk of overlapping the screens.

Further, a mask plate 1 made of a frame-like body
Engagement claw 13 spring-biased in a direction projecting from the outer edge of
Is provided so that the mask plate 10 can be easily and reliably attached to and detached from the film holder main body 1.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a film holder main body of a film holder according to an embodiment of the present invention.

FIG. 2 is a plan view showing a mask plate detachably mounted on the film holder main body of FIG. 1;

FIG. 3 is a back view thereof.

FIG. 4 is an enlarged plan view showing the configuration of the central portion of the upper frame portion of the mask plate, and showing the configuration upside down from FIG. 1;

FIG. 5 is a perspective view thereof.

FIG. 6 is a front view thereof.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4;

FIG. 8 is an enlarged plan view of a main part showing a state where the mask plate is mounted on the film holder main body.

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

FIG. 10 is a plan view showing an arrangement state of an aperture size recognition arm of a mask plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film holder main body 2 Mount part 3, 11 aperture 4 Engagement groove 5A, 5B Switch button 6, 7 Electric contact part 10 Mask plate 12 Upper frame part of mask plate 13 Movable engaging claw 14 Operation knob 15 Leaf spring 16 Metal sheet 17 Arm (Switch Actuator) 18 Lower Frame of Mask Plate 19 Fixed Engagement Claw SA, SB Electric Switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhiko Yamamoto 1-3324 Uetake-cho, Omiya City, Saitama Prefecture Inside Fuji Photo Optical Co., Ltd. (72) Inventor Hisashi Hamada 3-11-46 Izumi, Asaka City, Saitama Prefecture Fuji (72) Inventor Tokuji Sato 3-11-46 Izumi, Asaka-shi, Saitama Prefecture Fuji-sha Shin Film Co., Ltd

Claims (5)

[Claims] A plurality of mask plates provided with apertures having different sizes from each other; and a film holder main body configured to selectively and interchangeably mount one of the plurality of mask plates. Characteristic film holder. 2. The apparatus according to claim 1, wherein said mask plate and said film holder main body are provided with identification means for identifying an aperture size of said mask plate mounted on said film holder main body. Film holder. 3. The apparatus according to claim 2, wherein the identification means comprises a plurality of electric switches provided on the film holder main body, and an actuator provided on the mask plate for selectively operating the plurality of electric switches. 3. The film holder according to claim 2, wherein 4. The film holder according to claim 3, wherein, among the plurality of mask plates, a mask plate having an aperture having a minimum size includes an actuator for operating all of the plurality of electric switches. . 5. The mask plate comprises a frame having the aperture at the center thereof, and the frame includes an engaging claw spring-biased in a direction projecting from an outer edge of the frame. 2. The film holder according to claim 1, wherein the film holder is provided so as to be able to protrude and retract from the outer edge.