JP2006195171A - Finder display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finder display apparatus capable of obtaining a clear object image of high visibility in an object image observing area, regarding a finder optical system having a focusing screen for observing the focal state of a photographing lens. <P>SOLUTION: The finder display apparatus performs superimposition display of superimposing on the object image by a transmission type display element having a transparent electrode, and in observing the transmission type display element through an eyepiece, the observation is carried out through the focusing screen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera finder display device.

Conventionally, what displays photographing information in a finder of a camera, for example, uses an organic EL element as shown in Patent Document 1, and uses a transmissive LCD as shown in Patent Document 2. ing.
JP 2000-221578 A JP-A-8-136994

  However, in the conventional finder display device, since display elements are arranged on the eyepiece side with respect to the focusing screen, it is common to use transparent electrodes to drive each element. Even if there is a slight difference in transmittance with the part where the electrode wiring is not done, or the surface reflection condition is different, the wiring pattern which is a non-lighting part can be seen in the finder, As a result, there is a problem that the viewfinder looks worse.

  The finder display device of the present invention can superimpose and display on a subject image with a transmissive display element having a transparent electrode in a finder optical system having a focusing screen for observing the focus of a photographing lens. The transmissive display element is observed through the focusing screen when viewed from the eyepiece.

  According to the present invention, in a finder optical system having a focusing screen for observing the focus of a photographic lens, a transmissive display element having a transparent electrode can superimpose and display on a subject image. When the transmissive display element is observed from the lens, the transparent electrode wiring part other than the display part of the transmissive display element is hardly observable with the naked eye due to the diffusion effect of the focusing screen. Therefore, a clear and clear subject image can be obtained in the area where the subject image is observed.

  Furthermore, by reducing the light diffusibility of the focusing screen in the range of at least the same size corresponding to the display part of the transmissive display element as compared with the part other than the display part, the transmissive type Even if the display of the display element is a light emission type display or a shutter type display in which the finder transmitted light is shielded, the display is not blurred and a clear display can be performed.

[Example 1]
1 to 4 show Embodiment 1 of the present invention. FIG. 1 is a longitudinal sectional view of a single-lens reflex camera. In FIG. 1, reference numeral 1 denotes a photographing lens for forming an image of a subject. The lens group 2 is held. Reference numeral 3 denotes a reflection mirror for bending the subject light A toward the viewfinder light B by approximately 90 degrees. When a release button (not shown) is pressed, the reflection mirror 3 is retracted upward and the subject light A is captured by the image sensor 4. , And electrical conversion is performed to complete the exposure. A transmissive display element 5 is a self-luminous transparent EL type or a guest-host type LCD type that shields and displays the finder light B. Reference numeral 6 denotes a focusing screen, which has light diffusivity on one side so that blur can be confirmed when the subject light A that has passed through the photographing lens 1 is focused, and the light diffusibility of the focusing screen 6 is improved. The blur is minimized when the subject light A is in focus on the one side that is held. Reference numeral 7 denotes a pentaprism for making the subject light A an erect image. Reference numeral 8 denotes an eyepiece lens group that allows the subject image formed on the focusing screen 6 to be observed with the naked eye 9.

  FIG. 2 is an exploded perspective view showing the configuration of the transmissive display element 5, wherein 10 is a cover glass, the transparent electrode 11 is attached to the back surface, and the display segments 11a, 11b, 11c, 11d, 11e are displayed. The segment electrode is configured as follows. Reference numeral 12 denotes an insulating layer, and reference numeral 13 denotes a display layer. A light-emitting layer is set for a self-emitting transparent EL type, and a liquid crystal layer is inserted for a guest-host LCD type. 14 is a lower insulating layer, 15 is a common electrode mounted on the base glass 16, and overlaps only at positions corresponding to the segment electrodes 11a, 11b, 11c, 11d and 11e which are display portions of the transparent electrode 11. Is set to form a counter electrode.

  FIG. 3 is a perspective view showing the relationship between the transmissive display element 5 and the focusing screen 6. The focusing screen 6 includes segment electrodes 11 a, 11 b, 11 c that are display portions of the transparent electrode 11 of the transmissive display element 5. Display areas 6a, 6b, 6c, 6d, and 6e are set at positions corresponding to, 11d, and 11e, respectively, and are set so as to reduce the light diffusibility with respect to the mat surface 6f having sufficient light diffusibility. The display of the transmissive display element 5 does not blur and can be observed with the naked eye 9 as a clean image. Also, the transparent electrode wiring portions of the segment electrodes 11a, 11b, 11c, 11d, and 11e, which are display portions, require 11f, 11g, 11h, 11i, and 11j, respectively, and are connected to a control board (not shown) at the connector portion 5a. It is supposed to be. However, the transparent electrode wiring portions 11f, 11g, 11h, 11i, and 11j are transparent, but change somewhat in the transmissive state or the reflective state, so that they can be observed with the naked eye 9, so By setting the mat surface 6f having sufficient light diffusibility on the eyepiece 8 side that is very troublesome at the time of observation, the transparent electrode wiring portions 11f, 11g, 11h, 11i, and 11j are formed. It became possible to make it completely invisible with the naked eye 9 by light diffusion or blurring.

  FIG. 4 is a configuration diagram for explaining the principle that the display of the transmissive display element 5 does not blur in the relationship between the transmissive display element 5 and the focusing screen 6 and can be clearly observed with the naked eye 9. The element 5 includes a sealant 17 for the display layer 13. When the display layer 13 is a guest-host type LCD or the like, it also serves as a spacer for keeping the thickness of the display layer 13 constant. Ba and Bb are subject light rays incident from the taking lens 2, and Ba is a light ray that has passed through the non-display portion of the transmissive display element 5, and is formed on the mat surface 6 f with sufficient light diffusibility of the focusing screen 6. The amount of blur is changed to Ca, and the amount of blur is changed by adjusting the focus. Bb is a light beam that has passed through the display unit of the transmissive display element 5 and is set so as to pass through the 6a surface with reduced light diffusibility so that the subject image is less likely to be blurred. If 5 is a self-luminous type transparent EL type, the superimposed light display is such that the emitted light beam D1 appears to overlap the subject image light beam. The emitted light beam D1 passes through the surface 6a having reduced light diffusibility, so that the naked eye 9 can observe the D2 light beam and the Cb light beam as a clean display without bleeding. Further, when the transmissive display element 5 is a guest-host LCD type, only the portion where the counter electrode 11 and 15 overlap the display portion 11a is colored, and the light ray Bb of the subject image is displayed on the display segment portion. The arc-shaped display 11a is displayed by shielding with 11a. Even in this case, the boundary between the display unit 11a and the non-display unit is observed in the area 6a where the light diffusibility is reduced. It is set so that it is possible to make a neat display that does not blur.

  1 to 4, when the subject image is observed with the naked eye 9, the subject light A is bent by about 90 degrees by the reflection mirror 3 as an image formed by the photographing lens group 2, and is on the finder light B side. After passing through the transmissive display element 5 and forming an image on one surface with light diffusibility on the focusing screen 6, the subject image is minimally blurred, passes through the pentaprism 7, and is unaided by the eyepiece 8. It is a mechanism that can be observed as if the focus is in focus at 9. In this observation state, the light beam that has passed through the display unit of the transmissive display element 5 is set so as to pass through the surface 6a having reduced light diffusibility, so it is difficult to determine whether or not it has been focused. Compared with the entire surface of the screen 6, the display section is only a part and is configured not to be an obstacle to focusing.

  In addition, the transparent electrode wiring portions 11f, 11g, 11h, 11i, and 11j are transparent, but can be observed with the naked eye 9 by being slightly changed in the transmission state or the reflection state. What is extremely troublesome at the time is that the transparent electrode wiring portions 11f, 11g, 11h, 11i, and 11j are made light by setting the mat surface 6f having sufficient light diffusibility to the eyepiece 8 side. It was possible to make it completely invisible with the naked eye 9 by diffusion or blurring.

  When the autofocus function of the camera is activated by pressing the first stroke of a release button (not shown), the display units 11a and 11e are first energized. For example, in the case of a self-luminous transparent EL type As a display of the autofocus area, a semicircle display is displayed on the left and right, and any one of the autofocus points 11b, 11c, and 11d is lit to notify the photographer of the in-focus state. Thus, the display can pass through the surface 6a having reduced light diffusibility, thereby making it possible to provide a clear display without bleeding.

[Example 2]
FIGS. 5 and 6 show Embodiment 2 of the present invention, which are displayed at positions corresponding to the segment electrodes 11a, 11b, 11c, 11d, and 11e of the transparent electrode 11 that is the display portion of the transmissive display element 5, respectively. Areas 6a, 6b, 6c, 6d, and 6e are set, and the display area is configured as a single surface, which is a flat surface, a spherical surface, or an aspherical surface. In particular, FIG. 5 shows an embodiment in which the display area is flat. However, the present invention is not limited to this, and the light diffusibility can be further reduced by using a single surface, thereby minimizing display blur. It is possible to limit the display to a cleaner display.

  6 shows the display size H1 of the segment electrodes 11a, 11b, 11c, 11d, and 11e of the transparent electrode 11 that is the display part of the transmissive display element 5, and the display areas 6a, 6b at positions corresponding to the display parts. It is the figure which showed the relationship with the magnitude | size H2 of 6c, 6d, and 6e. Whether the display part of the transmissive display element 5 is a self-luminous transparent EL type or a guest-host type LCD type, the display size H1 as a whole has the light diffusibility of the focusing screen 6 when displaying anyway. It is necessary not to interfere with the mat surface 6f that is sufficiently held. If the display areas 6a, 6b, 6c, 6d, and 6e interfere with the mat surface 6f, the interference portions are blurred and the display is difficult to see. Therefore, including the assembly accuracy, the display area size H2 must be equal to or greater than the display area size H1. In terms of the formula, it is necessary that H1 ≦ H2.

  Also in the case of Example 2, the surface of the focusing screen 6 other than the display areas 6a, 6b, 6c, 6d, and 6e in order to hide the transparent electrode wiring portions 11f, 11g, 11h, 11i, and 11j, It is necessary that the mat surface 6f has sufficient light diffusibility, and the focusing screen 6 is set on the eyepiece 8 side.

It is a longitudinal cross-sectional view of the camera which shows the Example of this invention. It is a disassembled perspective view of the transmissive display element of this invention. It is a perspective view which shows the display state of the transmissive display element of this invention. It is explanatory drawing which shows the principle of Example 1 of this invention. It is explanatory drawing which shows the principle of Example 2 of this invention. It is dimension explanatory drawing of the transmission type display part of Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shooting lens 4 Image pick-up element 5 Transmission type display element 6 Focusing screen 6a, 6b, 6c, 6d, 6e Display area 6f Mat surface 7 Penta prism 8 Eyepiece group

Claims (5)

  In a finder optical system with a focusing screen for observing the focus of the photographic lens, a transmissive display element with a transparent electrode can be superimposed on the subject image for superimposition display. A finder display device characterized in that when observing an element, it is performed through the focusing screen.   The finder display device according to claim 1, wherein the focusing screen has a surface state having light diffusibility.   2. The light diffusibility of the focusing screen in a range of at least an equivalent size corresponding to a display portion of the transmissive display element is reduced as compared with a portion other than the display portion. The finder display device described in 1.   2. The focusing screen in a range of at least an equivalent size corresponding to a display portion of the transmissive display element is configured by a single surface different from a portion other than the display portion. Finder display device. The finder display device according to claim 4, wherein the single surface is a flat surface, a spherical surface, or an aspherical surface.

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