JPH0538340Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is a display that combines a liquid crystal display device and a translucent display device in which a light-transmitting mark portion is illuminated with light from a light-emitting member to display a translucent display. Regarding equipment.

Prior Art This type of display device is applied to a single-lens reflex camera so that a transparent display image obtained by illuminating a light-transmitting mark part with light from a light emitting diode and a liquid crystal display image can both be observed in the viewfinder. What has been done is known.

In display devices applied to such cameras,
The transparent display window, which is placed in the optical path of the liquid crystal display device so that the liquid crystal display image can be observed within a predetermined image frame, and the light transmitting mark member in the transparent display device are each configured separately. In addition to increasing the number of parts, the position of each member was changed in order to match the diopter of the liquid crystal display image and the translucent display image, and to prevent the light transmissive display window and the light transmissive mark from being installed at an angle with respect to the liquid crystal display image. This has the disadvantage that the configuration and assembly are complicated.

Problems to be Solved by the Invention This invention provides a display device that includes a liquid crystal display device and a translucent display device in which a light-transmitting mark portion is illuminated with light from a light-emitting member to display a translucent display.
It is an object of the present invention to provide a display device which eliminates the above-mentioned drawbacks of the conventional example, can reduce the number of parts, allows easy dioptric adjustment of a liquid crystal display image and a translucent display image, and is simple in configuration and assembly.

Means for Solving the Problems This invention provides an in-viewer display device that uses both a liquid crystal display device and a light-transmitting display device that illuminates a light-transmitting mark portion with light from a light-emitting member to display a light-transmitting display. , a light-shielding member having both a light-transmitting mark portion of the light-transmitting display device and a light-transmitting display window provided so that a liquid crystal image of the liquid crystal display device can be observed within a predetermined image frame; , the light shielding member is fixed to one surface of two glass plates that sandwich the liquid crystal.

Function: The number of parts can be reduced because the light-transmissive mark portion of the translucent display and the translucent display window, which serves as the picture frame of the liquid crystal display, are constructed of the same light-shielding member. Further, since the light shielding member as described above is fixed to one surface of the two glass plates that sandwich the liquid crystal, no structure or adjustment operation for adjusting the diopter is required.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 13. FIG. 1 shows a pentaprism 1
This figure shows a cross section of a display device in the viewfinder of a single-lens reflex camera in which an image of a liquid crystal plate 2 placed above and in front is introduced into the pentaprism from the bottom of the front surface of the pentaprism through the front surface of the pentaprism.
The liquid crystal plate 2 is supported by a holder 3 shown in the first view. Above the liquid crystal plate 2, a lighting prism 4, which is also supported by the holder described above, is arranged. Further, below the liquid crystal plate 2, two mirrors 5 and 6 are attached to the holder 3 at positions facing each other.

On the other hand, an in-finder prism 7 is arranged at the lower front of the pentaprism 1, and the image on the liquid crystal plate 2 is reflected by mirrors 5 and 6 and is incident on the in-finder prism 7, and is reflected within this prism 7. After that, the light enters the eyepiece lens 8 of the viewfinder through the pentaprism 1, and the image on the liquid crystal plate 2 is projected on the lower side of the field of view within the viewfinder.

As shown in FIG. 3, the holder 3 has arm parts 3a, 3a that protrude rearward from both sides thereof, and mounting pieces 9a, 9a that protrude from the upper edge of the front frame 9 of the camera. Inside each arm part 3 with screws 10, 10.
A and 3a are fixed with screws.

As shown in FIGS. 4 to 6, the liquid crystal plate 2 is
Two upper and lower glass plates 11 that sandwich a transmission type liquid crystal,
12, the upper surface of the glass plate 11, and the glass plate 12
It consists of polarizing filters 13 and 14 arranged on the lower surface of the. On the top surface of the glass plate 11, as shown in FIG. 5, there are a liquid crystal display frame 15a that displays shutter speed, aperture value, shooting mode, etc., a charging mark 15b that indicates the charging status of the flash device attached to the camera,
A focus mark 15c for indicating a focus state and position marks 15d for alignment are provided by depositing a metal material such as chromium or by printing a light-shielding paint, respectively. Polarizing filter 1 covering the light transmission marks 15b and 15c
3 and 14 may be omitted, and polarizing filters 13 and 1
4 may be arranged so as to cover only the liquid crystal display frame 15a. This eliminates the presence of a polarizing filter that attenuates light passing through the light transmission mark, making it possible to construct a more efficient transmission mark.

The flexible printed circuit board 16 electrically connected to the electrodes of the liquid crystal is connected to the glass plate 12 via an adhesive conductive sheet 17, as shown in FIGS. 4 to 6.
The elastic force of the leaf spring 13, one end of which is attached to the top of the holder 3 and heat-sealed to the holder 3, causes the holder 3 to
and a holding plate 19. Thereby, the attachment of the liquid crystal plate 2 to the holder 3 is also performed. A liquid crystal electrode terminal (not shown) is provided on the upper surface of the glass plate 12, and this electrode terminal is electrically connected to the flexible printed circuit board 16 via the conductive sheet 17. This electrical connection is
This is achieved even more reliably by the elastic clamping between the holder 3 and the presser plate 19. Position marks 15d, 1 deposited or printed on the top surface of the glass plate 11
5d is used as a guide for aligning the electrode terminal and the corresponding conductive pattern on the flexible printed circuit board 16. The leaf spring 18 is the sixth
As shown in the figure, it has a roughly U-shaped cross section with both sides bent, and mounting holes 18a and 18 are provided on both sides.
a is formed. On the other hand, the presser plate 19 has protrusions 19a and 1 that penetrate into the mounting holes 18a and 18a.
9a at both ends, and has a bent portion 19b at the front end that serves both to reinforce flatness and block harmful light, and cutouts 19c for observing the position marks 15d, 15d on the glass plate 11. The flexible printed circuit board 16 is made of a transparent film, and in the above-mentioned alignment, the position marks 15d, 15 on the glass plate 11 are seen through the non-patterned portions of the substrate 16 through the notches 19c, 19c of the presser plate 19.
d, conductive pattern and position mark 15d,
By aligning the substrates 15d so that they overlap, the substrate 1
6 and the electrode terminals are matched.

The main part of the flexible printed circuit board 16 is placed above the roof surface of the pentagonal prism 1 in a double folded state as shown in FIG. It is pressed along. Thereby, the position of the flexible printed circuit board 16 can be easily regulated without increasing the number of parts and the number of assembly steps.

As shown in FIGS. 3 and 4, the lighting prism 4 includes an external light entrance surface 4a, an internal light entrance surface 4b, a light diffusing exit surface 4c, a partition recess 4d, and a condenser lens section 4.
e, roughly wedge-shaped with mounting parts 4f, 4f;
The holder 3 whose mounting parts 4f and 4f are shown in FIG.
It fits into the protrusions 3b, 3b and is held by adhesive.

An illumination device 20 is provided at a position of the holder 3 facing the inner light incident surface 4b of the lighting prism 4. As shown in FIG. 9, this lighting device 20 includes three light emitting diodes L ₁ , L ₂ ,
L ₃ and 4 light emitting diodes for mark illumination
It includes a lighting board 21 to which L ₄ , L ₅ , L ₆ , and L ₇ are wire-bonded, and a light-shielding frame 22 heat-stamped onto the lighting board 21. The lighting board 21 is supported by attaching both ends thereof onto protruding bases 3c, 3c formed on the holder arms 3a, 3a shown in FIG. As shown in FIG. 9, the light-shielding frame 22 includes the entire light-emitting diodes L ₁ , L ₂ , L ₃ for liquid crystal lighting, and the light-emitting diodes L ₄ , L ₅ , L ₆ , L ₇ for mark lighting, respectively. A plurality of opposing openings 22a, 22b, 22c, 22
d, 22e are formed, and each of these openings faces the inner light incident surface 4b of the lighting prism 4.

On the lighting board 21, conductive patterns 21a near the light emitting diodes L ₁ , L ₂ , L ₃ for liquid crystal lighting,
As shown in FIG. 10, the electrodes 21b are spaced apart from each other so as not to be inadvertently short-circuited, and are formed so as to occupy a wider area than the necessary width for conductive function, and are coated with gold on the surface. It has been decorated with a matte finish. Due to the reflective action of the conductive patterns 21a and 21b, the light emitted from the light emitting diodes L ₁ , L ₂ , L ₃ toward the lighting board 21 side is reflected as shown in FIG. 11, and this is effectively used as illumination light. can do. Also, conductive pattern 2 connected to light emitting diodes L ₄ , L ₅ , L ₆ , L ₇ for mark illumination
1c, 21d, 21e, 21f, and 21g have patterns 21g ₁ , 21g ₂ , 21g ₃ , and 21e ₁ that are not necessary for direct conduction, as shown in FIG.
is formed to partition adjacent light emitting diodes. And these patterns 21
g ₁ , 21g ₂ , 21g ₃ , 21e ₁ are the light shielding frame 22
Partition parts 22f, 22g, 22h between each opening of
22i, and as shown in FIG. 12, each pattern and the partition portion shield light between adjacent light emitting diodes. If the above patterns 21g ₁ , 21g ₂ , 21g ₃ , 21e ₁ are not present, a gap will be created between the lighting board 21 and the light shielding frame 22 between each light emitting diode, as shown in FIG. However, as described above, this embodiment closes the gaps between the light emitting diodes. In this case, a clear and accurate display can be made.

Above the lighting prism 4, as shown in FIGS. 1 and 2, a shielding plate 23 having an opening 23a for letting in outside light is fixed to the holder 3, so that outside light does not illuminate the mark printed portion of the liquid plate 2. That's what I do. Further above the shielding plate 23, a lighting window 26 made of a transparent or milky white acrylic plate is provided so as to be sandwiched between the top cover 24 and front cover 25 of the camera. is made to enter the external light incident surface 4a of the daylight prism 4 through the opening 23a of the shielding plate 23.

In the lower half of the front surface of the pentaprism 1, there is an eighth
As shown in the figure, a positioning plate 27 for regulating the position of the in-finder prism 7 is attached via a double-sided adhesive tape (not shown), and in the figure, the right end surface 27a of the positioning plate 27 is flush with the side surface of the pentaprism 1. The lower end surface 27b is positioned at a predetermined height from the lower surface of the pentagonal prism 1. This positioning plate 27 is made of a metal plate, and has a bent portion 27c formed at its upper end to block stray light reflected from the front surface of the pentaprism 1 from entering the in-finder prism 7, and also has a bent portion 27c in its lower left and right halves. Positioning grooves 27d, 27d are formed in the portion. On the other hand, the in-finder prism 7 is made of a transparent synthetic resin integrally molded product, and includes an entrance surface 7a formed in the shape of a convex lens, a reflection surface 7b that guides the incident light to the pentaprism 1 side, an exit surface 7c, and formed on both sides. It has mounting portions 7d, 7d. Above mounting part 7
Protrusions 7e and 7e are formed on the back surfaces of d and 7d, respectively, and by fitting the protrusions 7e into the corresponding positioning grooves 27d of the positioning plate 27, the in-finder prism 7 is attached to the pentaprism 1 via the positioning plate 27. The positioning is measured. In this positioned state, the infinitor prism 7 is adhered to the positioning plate 27 with a quick-drying adhesive. As a result, the entrance surface 1a, which is not coated with reflective vapor deposition and is located outside the effective reflection area on the front surface of the pentagonal prism 1, and the exit surface 7 of the in-finder prism 7.
c faces each other. Regardless of this mounting configuration,
When attaching the infinitor prism 7 directly to the pentaprism 1, for example, if double-sided adhesive tape is used as the adhesive means, the adhesive area of the attachment portion is small and sufficient adhesive force cannot be obtained. If the attachment portion is made larger in an attempt to increase the bonding area, the attachment position will be misaligned due to plane errors that occur during molding of the infininder prism. Further, if a quick-drying adhesive is used as the bonding means, there is a risk that the vapor deposited film of the pentaprism 1 will peel off, and if a normal adhesive is used, there will be an inconvenience that it will take a long time for the adhesive to dry. On the other hand, in the mounting configuration of this embodiment in which the positioning plate 27 made of a metal plate is interposed as described above, the positioning plate 27 has good flatness and there is little error in the mounting position even if the adhesive surface is enlarged. It can be attached to the pentaprism 1 with a double-sided adhesive tape, and the in-finder prism 7 can be fixed using a quick-drying adhesive without peeling off the vapor deposited film of the pentaprism 1.

On the back surface of the holder 3 corresponding to the middle of the optical path between the mirrors 5 and 6, there is a protrusion 3d that blocks the light reflected on the upper front surface of the pentaprism 1 from entering the in-finder optical system. is formed.

In the above-mentioned in-finder optical system, the outside light (indicated by A in FIGS. 1 and 2) taken in through the lighting window 26 is restricted by the shielding plate 23 and contributes to illumination of the liquid crystal part of the liquid crystal plate 2. Only that light is incident on the outside light incident surface 4a of the daylight prism 4 as shown in FIG. Since the lighting window 26 is placed toward the front of the camera, the brightness of the in-finder, which takes in outside light and uses it as illumination light, is about the same as the brightness of the field of view seen through the viewfinder, and the LCD display becomes easier to see. The outside light entrance surface 4a and the exit surface 4c of the daylight prism 4 are set to form a predetermined acute angle, and the outside light that enters from the outside light entrance surface 4a is refracted within the daylight prism 4 and exits from the exit surface. The light is irradiated toward the liquid crystal panel 2 from 4c. Since the exit surface 4c has light diffusing properties, the illumination light becomes uniform and the display becomes easier to see. The external light that exits the lighting prism 4 illuminates the liquid crystal part of the liquid crystal panel 2, and the character images displayed there, such as the shutter speed, aperture value, and shooting mode, are displayed on the mirrors 5 and 6.
The light is reflected and enters the in-finder prism 7. The optical path leading to the in-finder prism 7 is parallel to the upper and lower front surfaces of the pentaprism 1, and the specularly reflected light from these surfaces becomes a ghost, creating an inverted image near the in-finder image. may occur. Such ghost images can be reduced to some extent by reducing the reflectance of each surface of the pentaprism 1, but when the angle of incidence exceeds 80 degrees, the specularly reflected light increases and the effect is not so great. do not have. However, in this embodiment, the projection 3d on the back surface of the holder 3 and the bent portion 27c formed on the positioning plate 27 cut off the reflected light that causes ghosts, and also reduce flare light.

On the other hand, the mark portion of the liquid crystal plate 2 is illuminated by the light emitted from the light emitting diodes L ₄ , L ₅ , L ₆ , and L ₇ of the illumination device 20. Internal light (secondly indicated by B) from these light-emitting diodes takes approximately the same optical path as external light after exiting the lighting prism. That is, as shown in FIG. 2, the internal light enters from the internal light incident surface 4b of the lighting prism 4, is reflected in substantially the same direction as the external light inside the external light incident surface 4a, and is reflected from the exit surface 4c into the liquid crystal plate 2.
It is ejected towards. As shown in FIG. 15, the exit surface 4c of the lighting prism is formed so that the surface 4c ₁ facing the liquid crystal display frame 15a and the surface 4c ₂ facing the marks 15b and 15c have different inclinations to prevent internal light and It is also possible to make the optical paths of external light even more equal. The shape of the lighting prism 4, the angle of the external light entrance surface 4a, and the arrangement of the illumination device 20 are set so that the internal light is almost completely reflected on the external light entrance surface 4a, but if the internal light is sufficiently bright. It is not always necessary to cause total reflection. Note that if the external light incident surface 4a is provided with some light diffusivity, the brightness will decrease somewhat, but the illumination can be made uniform.
The irradiated light from each of the light emitting diodes L ₄ , L ₅ , L ₆ , L ₇ is handled by each condensing lens section 4e provided on the inner light incident surface 4b of the daylight prism 4 so as to face them. Each mark 15 on the liquid crystal panel 2
b, 15c... Such a condensing lens may be arranged on the exit surface 4c in addition to the internal light entrance surface 4b, or on both the entrance surface 4b and the exit surface 4c.

When the field becomes dark to a certain extent, the image of the in-finder becomes invisible under the illumination of external light.
In such a case, the light emitting diode of the lighting device 20
By making L ₁ , L ₂ , and L ₃ emit light, the liquid crystal plate 2
The liquid crystal section is illuminated. In this example,
Such switching from external light to internal light can be achieved by simply selecting and switching the light source without depending on the insertion and removal, movement, or rotation of optical members, which simplifies the configuration. The internal light from these light emitting diodes L ₁ , L ₂ , L ₃ enters from the internal light incident surface 4b of the lighting prism 4, and
As in the case described above, the light is almost totally reflected on the external light entrance surface 4a, and is emitted toward the liquid crystal plate 2 from the exit surface 4c. In this embodiment, various marks such as a charging mark 15b and a focus mark 15c are also vapor-deposited or printed on the glass plates 11 and 12 that hold the liquid crystal display that displays text such as the shutter speed, aperture value, and shooting mode. Because of this, the diopter of the liquid crystal display and the mark match each other, making it easier to configure the optical system. Also, in the lighting device 20, the light emitting diodes L ₁ , L ₂ , L ₃ for liquid crystal lighting and the light emitting diodes L ₄ , L ₅ , L ₆ , L ₇ for mark lighting are arranged in the same row on the same lighting board 21. Therefore, the illumination between them becomes uniform, making it easier to see the infinder image. Since external light is not necessary when illuminating the liquid crystal section with internal light, the incidence of external light from the external light incident surface 4a of the lighting prism 4 may be blocked by another light shielding member at this time. .

The external light incident surface 4a of the lighting prism 4 is divided into a liquid crystal irradiation part and a mark irradiation part by a partition recess 4d, so that the mark part is irradiated with internal light from the light emitting diode for liquid crystal illumination, and the mark part is irradiated with internal light from the light emitting diode for liquid crystal illumination. There is no light leakage that occurs when the liquid crystal is irradiated with internal light from a light emitting diode.

Note that if the outside light entrance surface 4a of the daylight prism 4 is a semi-transparent mirror surface, it is not necessary to select the incident light so that the illumination light from the light emitting diode is totally reflected on the outside light entrance surface 4a, so the installation position of the light emitting diode can be changed. can be freely selected, and can be installed so that external light and internal light are emitted through approximately the same optical path as shown in FIG.

The display image of the liquid crystal plate 2 that is incident on the in-finder prism 7 via the mirrors 5 and 6 is transmitted to the focusing plate 28 by the convex lens-shaped entrance surface 7a of the prism 7.
The diopter of the image is adjusted with the field image projected on the image, and the image is enlarged, and then enters the pentaprism 1 via the reflection surface 7b and the exit surface 7c, and is further brought to the eyepiece 8.

In the above embodiment, the upper and lower two glass plates 1
In the liquid crystal plate 2 having a structure in which the liquid crystal is held between the points 1 and 12, the image of the liquid crystal display section that displays the shutter speed, aperture value, shooting mode, etc. is observed surrounded by a predetermined image frame in the field of view within the viewfinder. , liquid crystal board 2
A liquid crystal display frame 15 placed in the middle of the optical path that transmits the
a and various marks 15b to 15c illuminated by light from light emitting diodes _L4 to _L7 are provided by printing a light-shielding paint as a common mask member on the upper surface of the glass plate 11, but as the above mask member. Alternatively, the liquid crystal display frame 15a and various marks 15b to 15c may be punched out on a light shielding plate and then fixed to the upper surface of the glass plate 11. Alternatively, a structure may be adopted in which a light-shielding paint is printed on a transparent plate other than the glass plate 11 to form a mask member, and this is fixed to the upper surface of the glass plate 11. Furthermore, the mask member may be provided on the lower surface side of the glass plate 11, or may be provided on the upper or lower surface of the other glass plate 12. In some cases, a mask member may be printed or fixed directly on the liquid crystal surface.

The liquid crystal plate 2 is arranged so that the illumination light is incident from a direction deviated by a predetermined angle from the normal direction of the liquid crystal plate 2, so that when viewed from the normal direction of the glass plate 11, the center of the liquid crystal display frame 15a and the liquid crystal If they are aligned so that they coincide, in the image observed through the viewfinder, there will be a center shift between the liquid crystal display frame 15a and the liquid crystal display section due to the refraction effect of the glass plate 11. Therefore, in the above embodiment, the 14th
As shown in the figure, by the amount W corresponding to the above deviation,
The center of the liquid crystal display frame 15a and the center of the liquid crystal display section are shifted from each other for alignment. As a result, the liquid crystal display image observed through the viewfinder is
It is aligned to the center of the liquid crystal display frame 15a.

Effects of the Invention This invention is an in-finder display device that combines a liquid crystal display device with a light-transmitting display device that illuminates a light-transmitting mark portion with light from a light-emitting member to provide a light-transmitting display. Both the light-transmitting mark portion of the light-transmitting display device and the light-transmitting display window, which is provided so that the liquid crystal image of the liquid crystal display device can be observed within a specified frame, are made of the same light-shielding material, which has the effect of reducing the number of parts and making assembly easier.

Further, since the light shielding member as described above is fixed to one surface of the two glass plates that sandwich the liquid crystal, there is no need for any configuration or adjustment operation for adjusting the diopter.

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views showing an in-finder optical system of a camera to which an embodiment of this invention is applied, Figure 3 is an exploded perspective view of its essential parts, and Figure 4 is a sectional view of its essential parts. 5 is a plan view of the display section, FIG. 6 is a sectional view of the display section, FIG. 7 is a side view of the display section, FIG. 8 is an exploded perspective view showing the mounting structure of the in-finder prism, and FIG. The figure is a plan view of the lighting device, FIG. 10 is a plan view of the lighting board, and FIG. 11 is a plan view of the lighting device.
The figure is an explanatory diagram showing the light reflection effect of a conductive pattern, FIGS. 12 and 13 are explanatory diagrams each showing the light shielding effect between light emitting diodes in a lighting device, and FIG. 14 is an explanatory diagram showing the light refraction effect in a liquid crystal plate. , FIG. 15 is a perspective view showing a modification of the lighting prism. 2...Liquid crystal plate, 11, 12...Glass plate, 15
a...Liquid crystal display frame (transmissive display window), {15b...Charging mark, 15c...Focusing mark} Light transmission mark section, 20...Lighting device, _L1 to _L7 ...Light emitting diode.

Claims (1)

[Claims for Utility Model Registration] A front view screen for displaying a subject image; a light transmitting display means for illuminating a light transmitting mark part with light from a light emitting member outside the front view screen to display a light transmitting mark; In an in-viewer display device comprising: a liquid crystal display means for displaying a display using a liquid crystal member outside the screen, a light-transmitting mark portion of the light-transmitting display means and a liquid crystal image of the liquid crystal display means form a predetermined image. Both of the transmissive display windows provided so as to be observed within the frame have a light shielding member formed thereon, and the light shielding member is fixed to one surface of two glass plates that sandwich the liquid crystal of the liquid crystal member. A display device in a camera's viewfinder, characterized in that: