JPH09138660A - Optical display device with shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To broaden the visible range of an optical display device. SOLUTION: Acrylic resin being opalescent translucent material is used for the knob plate 11 of the tally back 7 of a rear tally (an optical display device with switch). Then, a protrusion 11a is made to be protruded at a side opposite to a tally lamp 5 from a tally cover 8. Mask plates 12, 13 fated with resin made of polycarbonate are overlapped over the nob plate 11. Then, the part from the bottom part of the protrusion 11a to the protrusion 11a becomes a light beam passing part through which display light beams pass and the display light beams are made to be diffused at the protrusion 11a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical display device with a shutter that can freely switch between opening and blocking of light, and more particularly to a technique for widening a visible range of display.

[0002]

2. Description of the Related Art Conventionally, for example, in a television camera for broadcasting, a tally lamp is provided at a position where a viewfinder (hereinafter referred to as "VF") can be seen easily. By turning on the tally lamp during on-air, the photographed person who is the subject can know that his / her image is on-air. This tally lamp is important for the photographer as well, because he / she needs to know that the image of his / her camera is on air.

A portable television camera is equipped with a tally lamp in the VF. For example, when the camera is used by holding it over the head or taking a picture with a tripod, it is not necessary to look into the VF. There is also a rear tally on the back for easy tally confirmation. The cameraman can confirm that the rear tally is on air by visually observing the rear tally from behind.

However, for the photographer, this rear
Sometimes the tally is annoying. For this reason, this rear tally is usually provided with a shutter that opens / blocks the display light of the tally lamp of the rear tally. FIG.
Such a conventional optical display device with a shutter is shown. As shown in this figure, a rear tally tally lamp 32 is built in the housing of the VF31, a hole 33 is provided at a position where the display light of the tally lamp 32 is projected, and a shutter is provided on the hole 33.
34 is provided.

Normally, the hole 33 is left open, and when it is uncomfortable, the shutter 34 can be closed to turn off the tally display.

[0006]

By the way, in the conventional optical display device with a shutter, the tally lamp 32 has a structure.
The range that can be confirmed is narrow and inconvenient. That is, the shutter 34
Is configured to close the hole of the VF housing. Therefore, the visible range where the tally lamp 32 can be confirmed is narrowed,
It is limited to the angle θ ₁ .

Therefore, as described above, when the television camera for broadcasting is used by holding it over the head or when it is installed on a tripod or the like and photographed, even if the rear tally is visually recognized from a distant position, the visual recognition is difficult. It will be difficult. The present invention has been made in view of such conventional problems, and an object thereof is to provide an optical display device with a shutter having a wide visual range.

[0008]

Therefore, in the device according to the invention of claim 1, the light projecting means for projecting the display light, the light passing portion for passing the display light from the light projecting means, and the display are provided. An optical display device with a shutter having a light-shielding portion that shields light, and selectively locating them in an optical path from a light-projecting unit, and a shutter that can freely switch between opening and blocking of display light, The light passage portion of the shutter is formed of a member having a light diffusing property.

According to this structure, the display light is scattered at the light passing portion, so that the display light can be visually recognized in a wide range. In the apparatus according to the second aspect of the present invention, the light diffusing member used for the light passage portion of the shutter is a milky white translucent member. With this configuration, it is possible to scatter the display light by the milky white translucent member.

In the apparatus according to the third aspect of the present invention, the milky white translucent member used for the light passage portion of the shutter is made of acrylic resin. With this configuration, the display light can be scattered by the milky white translucent member made of an acrylic resin. Claim 4
In the device according to the invention, the light passage portion of the shutter is
It has a protrusion protruding to the side opposite to the light projecting means.

According to this structure, since the light passage portion of the shutter is projected, the display light spreads significantly in this portion. In the device according to the fifth aspect of the present invention, the light shielding portion of the shutter is made of polycarbonate resin.
With this configuration, it is possible to effectively block the display light.

In the device according to the sixth aspect of the present invention, the shutter is formed by integrally forming the light passage portion and the light shielding portion. With this configuration, the number of parts can be reduced. In addition, the number of steps is reduced, and it becomes possible to easily manufacture. In the apparatus according to the invention of claim 7, the shutter is configured to slide in a direction perpendicular to the optical path of the light projecting means to switch between the light passing portion and the light shielding portion, while sliding the shutter. With a case to hold,
The sliding contact portion between the shutter and the case is provided with an arc-shaped convex portion and an arc-shaped concave portion that are fitted and positioned at the positions of the light passage portion and the light shielding portion, and the radius of the convex portion is larger than the radius of the concave portion. Is also getting smaller.

According to this structure, the arcuate convex and concave portions are fitted to each other at the sliding contact portion between the shutter and the case, and the shutter is positioned. Also, since the radius of this convex part is smaller than the radius of the concave part and is loosely fitted, the shutter is
It is possible to easily slide from the position of the light passage portion or the light shielding portion. The apparatus according to the invention of claim 8 is used for a rear tally of a viewfinder of a television camera.

According to this structure, it is possible to confirm the rear tally in a wide range behind the television camera.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
~ It demonstrates based on FIG. Here, a case where the optical display device with a shutter of the present invention is applied to a rear tally of a VF of a portable broadcasting television camera equipped with a tally lamp will be described. However, as long as it has a freely switchable shutter that opens and blocks display light,
The application of this device is not limited to the rear tally.

FIG. 4 is a plan view showing the application example.
Note that the lens is omitted in this figure. As shown in this figure, the portable television camera 1 is provided with a VF2. A front tally 3 for notifying the person being photographed that the camera is on air is provided in front of the shooting of the VF2, and a rear tally 4 for notifying the photographer that the camera is on air is provided behind the shooting of the VF2. Is equipped with.

FIG. 5 is a partial cross-sectional view from the side of the VF 2 showing the structure of the rear tally 4. As shown in FIG. 5, the tally lamp 5 as a light projecting means for projecting display light is built in the housing of the VF2. An LED (Light Emitting Diode) or the like is used for the tally lamp 5. The housing of the VF2 is provided with a hole 6 for passing the display light of the tally lamp 5.

The tally back 7 corresponds to a shutter, and is a slide switch that can freely slide on the hole 6 in the XY directions. The tally cover 8 is a switch case that houses the tally back 7.
It is held while sliding. This tally cover 8
It is attached to the housing of the VF2 with screws 9 and 10.

1 and 2 are an enlarged sectional view and a plan view of the rear tally 4 of the first embodiment, respectively. As shown in these figures, the tally back 7 includes a light diffusing member, that is, a knob plate 11 formed of a milky white translucent member such as an acrylic resin, and a mask for shielding display light. It is composed of plates 12 and 13.

The knob plate 11 has a protrusion 11a protruding from the tally cover 8 on the side opposite to the tally lamp 5.
This portion has a function of a knob that can manually open and block the display light of the tally lamp 5. The mask plate 12 is
Except for this projection 11a, it is superposed on the surface of the knob plate 11 on the side of the projection 11a, and the mask plate 13 is superposed on the surface of the knob plate 11 on the opposite side except for the bottom of the projection 11a. The mask plates 12 and 13 are made of polycarbonate resin, for example.

The portion from the projection 11a to the bottom thereof corresponds to the light passage portion, and the portion masked by the mask plates 12 and 13 corresponds to the light shielding portion. The mask plate 12 has a protrusion 11a.
Since it is fitted in the X-Y
Slide in the direction. Further, by fitting the convex portion 11b provided on the bottom surface of the knob plate 11 and the concave portion 13a provided on the mask plate 12, the mask plate 12 is integrated with the knob plate 11 in the XY directions. To slide.

FIG. 3 shows a tally back 7 and a tally cover 8.
FIG. As shown in the figure, the tally back 7 and the tally cover 8 are in contact with each other so as to slide on the side surfaces thereof, and each of them is provided with a semicircular arc-shaped convex portion 14 and a concave portion 15. The recess 14 and the recess 15 fit together. These fitting positions become the opening and blocking positions of the display light of the tally back 7.

The convex portion 13 is formed of, for example, R0.6,
The recess 14 is formed of R0.5. That is, since the radius of the concave portion 14 is smaller than the radius of the convex portion 13, the fitting is loose. Therefore, the tally back 7 can be easily slid. In this way, the convex portion 14 and the concave portion 15 serve as simple stoppers.

Next, the operation will be described. When the subject is photographed by the portable television camera 1, the front tally 3 on the subject side is displayed as shown in FIG.
The tally lamp 5 of the rear tally 4 on the cameraman side lights up. To display the rear tally 4 as a tally, see Fig. 5.
Also, as shown in FIG. 6, the tally back 7 is slid in the X direction to move the light passing portion of the tally back 7 onto the hole 6. At this position, the convex portion 14 and the concave portion 15 are fitted, and the position of the tally back 7 is fixed.

The display light of the tally lamp 5 passes through the hole 6 and the light passage portion of the tally back 7 and reaches the projection 11a. Since the knob plate 11 is formed of a milky white translucent acrylic resin, the display light of the tally lamp 5 is scattered in the knob plate 11 and further scattered in a wide range by the protruding projections 11a.
Therefore, as shown in FIG. 1, the visible range is wider than in the conventional case and becomes the angle θ ₀ , and the display light of the tally lamp 5 appears to shine in a wide range.

When the display light of the rear tally 4 is obtrusive, the tally back 7 is moved in the Y direction by gripping the projection 11a. Since the convex portion 14 and the concave portion 15 are loosely fitted, the convex portion 14 and the concave portion 15 are easily disengaged from each other, and the tally back 7 slides on the tally cover 8 and slides to the position shown by the broken line. Then, the convex portion 14 and the concave portion 15 are fitted together. At this position, the tally back 7 is stably positioned, and the display light of the tally lamp 5 is blocked by the mask plate 13.

In this way, the tally display is controlled by sliding the knob plate 11 in the X-Y directions. According to this structure, the display light of the tally lamp 5 is scattered by using the milky white translucent acrylic resin for the knob plate 11, and the projection 11a projects from the tally cover 8. Light is scattered widely, and the viewing range is greatly expanded. For this reason, even when the cameraman holds the camera over his / her head or installs it on a tripod or the like, he / she should take his / her eyes off the VF2 and see that the image of his / her camera is on air in a wide range. I can know.

Next, a second embodiment will be described.
In the second embodiment, as shown in FIG.
Only the bottom of the knob plate 11 is overlaid. The second
According to the configuration of the embodiment of the present invention, since the mask plate 12 is not provided above the knob plate 11, the display light of the tally lamp 5 shines on the entire tally back 7 during photography, so that the visibility is further improved. Easy to see.

However, when the light-diffusing property of the member forming the light-passing portion is too large and the display light is felt too strongly, it is preferable to mask all the portions other than the protrusions as in the first embodiment. . Next, a third embodiment will be described.
This is one in which a tallyback knob plate and a mask plate are integrally molded.

In the third embodiment, as shown in FIG. 7, a knob plate 21 made of an acrylic resin is incorporated in a mask plate 22 made of a polycarbonate resin and integrally molded by, for example, thermal compression. By integrally molding as described above, the number of steps for manufacturing the tally bag can be omitted, the number of parts can be reduced, and the tally bag can be easily manufactured.

[0031]

As described above, according to the device of the first aspect of the present invention, since the display light is scattered by the light passage portion, the visible range is widened. According to the device of the second aspect, in the light passage portion of the shutter, the display light can be scattered by the milky white translucent member.

According to the third aspect of the invention, the display light can be scattered by the milky white translucent member made of acrylic resin. According to the device of the fourth aspect, since the light passage portion of the shutter is projected, the display light can be scattered at a wider angle in this portion. According to the device of the fifth aspect, the display light can be effectively shielded.

According to the apparatus of the sixth aspect of the present invention, the number of parts can be reduced, the man-hours can be reduced, and the device can be easily manufactured. According to the device of the seventh aspect of the invention, since the radius of the convex portion is smaller than the radius of the concave portion, it can be loosely fitted and easily slid from the determined position. According to the device of the eighth aspect, the rear tally can be confirmed in a wide range behind the television camera.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a plan view of a portable television camera to which the device of the present invention is applied.

5 is a partial cross-sectional view of a viewfinder to which the device of FIG. 1 is applied.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

FIG. 7 is a sectional view showing a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a conventional device.

[Explanation of symbols]

 1 Portable Television Camera 2 Viewfinder (VF) 4 Rear Tally 5 Tally Lamp 6 Hole 7 Tally Back 8 Tally Cover 11,21 Knob Plate 12,13,22 Mask Plate

Claims (8)

[Claims] 1. A light projecting unit for projecting display light, a light passing unit for passing display light from the light projecting unit, and a light blocking unit for blocking the display light, and selectively projecting them. In the optical display device with a shutter including a shutter that can freely switch between opening and blocking of display light by being positioned in the optical path from the means, the light passing portion of the shutter is formed by a member having a light diffusing property. An optical display device with a shutter characterized by the above. 2. The optical display device with a shutter according to claim 1, wherein the member having a light diffusing property used for the light passage portion of the shutter is a milky white translucent member. 3. The optical display device with a shutter according to claim 2, wherein the milky white translucent member used in the light passage portion of the shutter is made of an acrylic resin. 4. The shutter according to claim 1, wherein the light passage portion of the shutter has a protrusion protruding to the side opposite to the light projecting means. Optical display device. 5. The optical display device with a shutter according to claim 1, wherein the light-shielding portion of the shutter is made of a polycarbonate resin. 6. The optical display device with a shutter according to claim 1, wherein the shutter is formed by integrally molding a light passage portion and a light shielding portion. 7. The shutter is configured to slide in a direction perpendicular to the optical path of the light projecting means to switch between a light passing portion and a light shielding portion, and further comprises a case for holding the shutter while making sliding contact therewith. , In the sliding contact portion between the shutter and the case,
An arc-shaped convex portion and an arc-shaped concave portion for fitting and positioning at the positions of the light passage portion and the light shielding portion are provided, and the radius of the convex portion is smaller than the radius of the concave portion.
The optical display device with a shutter according to claim 6. 8. The optical display device with a shutter according to claim 1, which is used for a rear tally of a viewfinder of a television camera.