JP2012230281A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with simple structure, having the same structure and usage as a conventional one, and easy to use.SOLUTION: A display device 7 includes: a light emitting element 9; and a light guiding member 10 having an incident surface 10a on which light from the light emitting element 9 is incident, a first projection surface 10c for projecting a part of the light incident from the incident surface 10a in a given direction, a reflection surface 10b for reflecting the remainder of the light incident from the incident surface 10a in a direction different from the given direction, and a second projection surface 10d for projecting the light reflected from the reflection surface 10b.

Description

  The present invention relates to a display device.

  A display device that displays an operation state of an optical device or the like as a lighting state of a light emitting element is known. In order to be able to see the lighting state of such a display device from different directions, a plurality of light emitting elements visible from different directions are provided, or light from the light emitting elements is diffused in different directions with respect to one light emitting element. There is a method of welding a bundle of optical fibers for the purpose (for example, see Patent Document 1).

JP-A-8-032112

  However, the method of providing a plurality of light emitting elements or welding a bundle of optical fibers to one light emitting element complicates the structure and increases power consumption, and is designed for each device provided with this display device. Since it was necessary, there was a problem that the manufacturing cost was high.

  The present invention has been made in view of such problems, and an object thereof is to provide a display device that has a simple structure and is easy to use with the same structure and method of use as a conventional product.

  In order to solve the above-described problems, a display device according to the present invention includes a light source, an incident surface on which light from the light source is incident, and a first emission in which a part of the light incident from the incident surface is emitted in a predetermined direction. A light guide member having a surface, a reflective surface that reflects the remaining part of the light incident from the incident surface in a direction different from the predetermined direction, and a second emission surface that emits the light reflected by the reflective surface; It is characterized by having.

  In such a display device, it is preferable that the reflecting surface is arranged so that at least a part of the light incident on the reflecting surface is totally reflected.

  In such a display device, it is preferable that the reflecting surface is composed of two or more surfaces that reflect light in different directions.

  Moreover, in such a display device, it is preferable that the first emission surface is configured as a flat surface or a convex surface.

  Further, in such a display device, the light guide member has one bottom surface of the cylinder as an incident surface, a part of the other bottom surface is cut out, the cut out surface is a reflective surface, and a non-cut surface is formed. It is preferable that the first emission surface and the circumferential surface facing the reflection surface be the second emission surface.

  According to the present invention, it is possible to provide an easy-to-use display device with a simple structure and the same structure and usage as a conventional product.

It is explanatory drawing for demonstrating a field scope, Comprising: (a) shows a top view, (b) shows a side view. It is a principal part enlarged view of the field scope containing a display apparatus. It is sectional drawing of the said principal part. It is explanatory drawing for demonstrating a light guide member, (a) shows a perspective view, (b) shows a front view, (c) shows a top view, (d) shows a side view. It is a principal part enlarged view of the field scope which has the modification of a light guide member. It is explanatory drawing for demonstrating the modification of a light guide member, (a) shows a perspective view, (b) shows a front view, (c) shows a top view, (d) is a side view. Indicates.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the configuration of a field scope with an anti-vibration function (hereinafter, simply referred to as “field scope”) will be described with reference to FIG. 1 as a device on which the display device according to the present embodiment is mounted. The field scope 1 includes a housing 2 in which an objective lens group that forms an image of an observation object, an erecting prism that converts an image of the objective lens group into an erect image, and the like, and an outer peripheral portion of the housing 2 A focus ring 3 for moving a focus lens for focusing on an observation object in the optical axis direction, and an eyepiece lens for magnifying and observing an image formed by the objective lens group. And a tripod seat 5 for attaching the housing 2 to a tripod. Further, the objective lens group of the field scope 1 is provided with an anti-vibration lens, and the control unit built in the case 2 detects the vibration of the case 2 and blurs the image due to the detected vibration. The vibration-proof lens is configured to move so as to have a component in a direction orthogonal to the optical axis so as to cancel out.

  The field scope 1 is mounted on a tripod and is set to a height that allows easy observation. The field scope 1 is used by confirming an observation object from an eyepiece and operating the focus ring 3 to focus. At this time, since the image of the observation object observed with the field scope 1 has a high magnification, the observation image blurs due to external vibrations such as wind and operation of the focus ring 3. For this reason, such image blur is corrected by the image stabilization mechanism controlled by the control unit described above. ON / OFF of the vibration isolation mechanism is selected by a VR-ON / OFF switch 6 provided on the upper surface of the housing 2. Further, a display device 7 for displaying the operation state (ON / OFF) of the anti-vibration mechanism is provided on the upper surface of the housing 2, and when the anti-vibration mechanism is ON, the display device 7 is turned on. The display device 7 is configured to be turned off when the vibration isolation mechanism is OFF.

  Now, the configuration of the display device 7 mounted on the field scope 1 will be described with reference to FIGS. The display device 7 includes a light emitting element (light source) 9 mounted on the light emission control substrate 8 and a light guide member 10 that is disposed on the side from which light is emitted from the light emitting element 9 and formed of a material that transmits light. And is fixed to the housing 2. The light guide member 10 of the display device 7 has a cylindrical shape, and one tip side surface thereof (the bottom surface on the light emitting element 9 side) forms the incident surface 10a, and the other tip side surface. Approximately half of the bottom surface (the bottom surface facing the incident surface 10a) is cut away to form the reflecting surface 10b, and the remaining approximately half of the bottom surface forms the first exit surface 10c. Furthermore, the part which opposes the reflective surface 10b among the circumferential surfaces of this light guide member 10 forms the 2nd output surface 10d. The light guide member 10 is disposed with respect to the housing 2 such that the incident surface 10 a faces the light emitting element 9, and the other tip side (second emission surface 10 d) is from the upper surface of the housing 2. It is attached so as to protrude outward.

  The first exit surface 10c is not limited to a flat surface, and may be a convex curved surface (spherical surface or aspherical surface). Further, the upper surface of the casing 2 surrounds the circumferential surface on the side where the reflecting surface 10b of the light guide member 10 protruding from the upper surface of the casing 2 is formed (of the cylindrical light guide member 10). A wall portion 2 a is formed so as to surround substantially half of the circumferential surface and open to the eyepiece side of the field scope 1, and the wall portion 2 a is formed higher than the light guide member 10. A semicircular lid 2b is attached so as to close the opening above the wall 2a. The wall portion 2a and the lid portion 2b can protect the light guide member 10 from an external impact.

  In the display device 7, when the light emitting element 9 emits light, the light enters the light guide member 10 from the incident surface 10 a, and the light is guided upward by the light guide member 10. Then, a part of the light is emitted upward from the first exit surface 10c, a part of the light is reflected by the reflecting surface 10b, and is emitted laterally (eyepiece side) from the second exit surface 10d. Therefore, when the display device 7 is viewed from above, the light emitted from the first exit surface 10c can be recognized, and when viewed from the lateral direction (eyepiece side), the second exit surface 10d. Can be recognized. As described above, since approximately half of the light guide member 10 is cut away, the lid 2b covers the reflective surface 10b and the first exit surface 10c is opened upward when viewed from above. Yes.

  Here, the incident angle θ of the light beam emitted from the light emitting element 9 and incident on the reflecting surface 10b, that is, the angle θ formed by the light emitting surface of the light emitting element 9 and the reflecting surface 10b satisfies the following conditional expression (1). By configuring the light guide member 10 so as to be equal to or greater than the critical angle, the light from the light emitting element 9 can be totally reflected by the reflecting surface 10b and guided to the second exit surface 10d. In this conditional expression (1), N1 is the refractive index of the material of the light guide member 10, and N2 is the refractive index of air.

θ> sin ⁻¹ (N2 / N1) (1)

  Thus, by totally reflecting the light from the light emitting element 9 by the reflecting surface 10b, the light incident on the reflecting surface 10b can be efficiently guided to the second exit surface 10d. Further, it is not necessary to perform aluminum vapor deposition or the like on the outside of the reflecting surface 10b, and the manufacturing cost of the light guide unit 10 can be reduced.

  In addition, the reflective surface formed in the light guide member 10 is not limited to one, You may form two or more reflective surfaces. For example, the light guide member 10 ′ shown in FIGS. 5 and 6 includes a first reflection surface 10 a ′ that reflects light in two different directions in the lateral direction (eyepiece lens side) of the field scope 1 and a second reflection. The case where the surface 10b 'is formed is shown. If the plurality of reflecting surfaces 10 a ′ and 10 b ′ are provided at the tip of the light guide member 10 in this way, the light emission state of the display device 7 can be confirmed over a wide range on the eyepiece side of the field scope 1. Further, such a reflection surface may be a curved surface (for example, a cylindrical surface) whose reflection direction continuously changes.

  In the display device 7, the light guide member 10 may be attached to the light emitting element 9, or may be arranged apart as shown in FIG. In addition, the light guide member 10 may not be cylindrical, and may be, for example, a polygonal column.

  In the case of the field scope 1 as described above, it is difficult to see the display device 7 from above because the height when the tripod is used is generally located at the height of the eyes of the observer. If the display device 7 is configured as described above, the lighting state can be confirmed not only in the upward direction but also in the lateral direction (eyepiece lens side), so that the display device 7 can be easily confirmed. it can. At this time, the light guide member 10 can have the simple shape as described above, and a special coating or the like is not required on the reflection surface, so that the cost of the display device 7 can be reduced. An easy-to-use display device can be provided with a simple structure and the same structure and method of use as a conventional product.

7 Display device 9 Light emitting element (light source) 10, 10 'Light guide member 10a Incident surface 10b Reflecting surface 10c First exit surface 10d Second exit surface 10a' First reflecting surface 10b 'Second reflecting surface 10c' First exit surface

Claims (5)

A light source;
An incident surface on which light from the light source is incident, a first emission surface that emits a part of the light incident from the incident surface in a predetermined direction, and a remaining part of the light incident from the incident surface are A display device comprising: a reflection surface that reflects in a direction different from a predetermined direction; and a light guide member that has a second emission surface that emits the light reflected by the reflection surface.   The display device according to claim 1, wherein the reflection surface is arranged so that at least a part of the light incident on the reflection surface is totally reflected.   The display device according to claim 1, wherein the reflection surface is configured by two or more surfaces that reflect the light in different directions.   The display device according to claim 1, wherein the first emission surface is configured as a flat surface or a convex surface.   The light guide member has one bottom surface of a cylinder as the incident surface, a part of the other bottom surface is notched, the notched surface is the reflecting surface, and the uncut surface is the first exit surface. The display device according to any one of claims 1 to 4, wherein a circumferential surface facing the reflection surface is the second emission surface.

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