JPH0743848Y2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an illuminator, and more particularly to an illuminator suitable for illuminating an optical transmission body such as an optical transmission rod or an optical transmission fiber bundle.

[Conventional technology]

In an illuminator for optical fiber bundle lighting, in which light is incident on one end of the optical fiber bundle and the other end is arranged in a line to emit a linear light beam, the light from the light source is reflected to improve the space factor. A method may be used in which the member is reflected and the optical path is bent halfway. (For example,
See Japanese Patent Laid-Open No. 1-14803).

[Problems to be solved by the device]

In the conventional method of bending the optical path, it is necessary to interpose a reflecting member to bend the optical path, as compared with the case where the optical path is linear. Since the reflectance of this reflecting member cannot be 100%, the amount of light when the optical path is bent must be reduced as compared with the amount of light when the optical path is linear.

In particular, for fiber lighting for high light intensity applications and JP-A-62-14
When used for illumination of an illuminating device using an optical transmission rod made of a quartz glass rod, an optical glass rod, a silicone resin rod, an acrylic resin rod, etc. disclosed in Japanese Patent No. 2465, etc. However, the method of simply reflecting the light from the light source on the reflecting member and bending the optical path without collecting the light does not sufficiently improve the reduction of the light amount, and the light collecting efficiency is poor.

That is, in any case, the conventional method of bending the optical path, which is often used in a fiber bundle for a linear light source, a liquid crystal video projector, or the like, makes a predetermined area uniform in order to make the distribution of the linear light uniform. The focus is only on irradiating. That is, the light from the light source is not condensed by the condensing member, and is irradiated to the reflecting member as a wide light flux, and the light of the wide light flux is incident on the incident end of the fiber bundle or the like by the reflection of the reflecting member. . Therefore, in terms of the light collection efficiency, there is a sacrifice, and a satisfactory light collection efficiency cannot be achieved. However, in the case of the optical transmission rod, the method for making the distribution of the linear light uniform can be performed by processing the optical transmission rod itself, so it is necessary to design mainly for the pursuit of light collection efficiency. It was

However, in the conventional method, there is a problem that the power consumption of the light source must be increased in order to compensate for the decrease in light amount, and the apparatus as a whole is relatively large, which leads to downsizing. There was a problem that not.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to improve the light collection efficiency and to have a uniform change in the spectral distribution characteristics of the reflecting member. It is therefore an object of the present invention to provide an illuminator in which the optical path can be bent without causing a decrease in the amount of light, the reflecting member is small and low cost, and the entire device is small and lightweight.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the lighting device according to the present invention comprises:
The light emitted from the light bulb with a reflector, which is the light source, is bent 90 ° by the reflection member to enter the incident end of the light transmission body, and this light bulb with a reflector has a conical optical path from the emission end to the reflection member, and In accordance with the angle of collection, the coupling gap at the incident end of the optical transmission body is minimized to improve the efficiency of collection, and further, the closed diameter of the bulb with a reflector and the collection point from the light emitting part of the bulb with a reflector to the collection point. The optical distances (working distances) are made substantially equal.

[Action]

Since the optical path from the emitting end of the light bulb with a reflector to the reflecting member is conical, there is little light leakage loss at the coupling part, and the aperture diameter of the light bulb with a reflector and the working distance of the light bulb with a reflector are approximately the same. The maximum incident angle of about 27 ° reduces the effect of Fresnel reflection on the incident end face, shortens the total optical path, and causes the light condensing part caused by the displacement of the bulb filament or the curvature error of the reflector of the bulb with a reflector. The spread of the beam waist of the light flux is reduced, and the efficiency of narrowing the light flux is improved, so that the light collection efficiency is improved. Further, since the optical path from the emission end of the light bulb with a reflecting mirror to the reflecting member has a conical shape, the shape of the reflecting member can be small, and the compactness and lightening of the light collecting member can be promoted as the optical path design becomes compact. And the manufacturing cost can be reduced.

〔Example〕

Hereinafter, a lighting device according to the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment according to the present invention, in which the illuminating device has diffusion fringes 1 formed by applying fine powder having a high refractive index in the form of linear fine stripes in the axial direction on the outer peripheral surface. A rod-shaped optical transmission body 2 having the above, a pair of thin-walled tubes (FEP heat-shrinkable tubes) 3 made of heat-shrinkable fluororesin that are fitted into both ends of the optical transmission body 2, and the optical transmission body. 2 end face 2b
The ceramic sheet 4 for diffusing the reflected light located at the position, and the linear light emitting slit surface 5 in which the slits 5a extending in the axial direction are cut out while the optical transmission body 2 is positioned inside.
The cylindrical mirror 6, the cap 7 that engages with the end 6b of the cylindrical mirror 6, the seal member 8 that engages with the tip 6a of the cylindrical mirror 6, and the seal 6 attached to the cylindrical mirror 6 The light collecting member 9 and the reflecting member 10 attached to the light collecting member 9 are provided.

The condensing member 9 has a substantially pyramid shape, a rectangular bottom portion 9a has a circular opening, and a solid spring attached to the screw hole 9c of the side surface portion 9b with a washer 9d by a screw 9e. The reflector 11a of the light bulb 11 with a reflector is attached by 9f. The diameter of the circular opening of the bottom surface portion 9a is substantially the same as the diameter of the opening of the reflecting mirror 11a.
A conical light-collecting surface 9g is formed on the inner surface of the light-collecting member 9 so as to be continuous from the circular opening of the bottom surface portion 9a, and penetrates with an axis B orthogonal to the central axis A of the cone as a central axis. The hole 9i is formed. This through hole 9i is used for the cylindrical mirror 6.
It is set so that the central axis of the optical transmission body 2 that covers is overlapped with the axis B and is closely fitted.

The slope facing the through hole 9i is notched, and the elliptical hole 9j
Are formed. The elliptical hole 9j is formed by a reflecting member 10 sandwiched between a locking member 9n fixed to a screw hole 9k formed at the top of the condenser 9 with a screw 9m via a washer 9l and a step 9o. It is shielded.

The angle formed by the reflecting member 10, the axis A, the axis B, and the conical light-collecting surface 9g is set as shown in FIG. 4, for example.
That is, the angle is 45 ° with respect to the axis A and the axis B. Further, when the light beam on the through hole 9i side is bent by the reflecting member 10 and becomes a light beam toward the center of the tip surface 2a of the light transmission body 2, the angle formed by the light beam and the reflecting member 10 is 71.
°. Furthermore, the light beam on the side facing the through hole 9i is bent by the reflecting member 10 to be the front end surface 2a of the optical transmission body 2.
When the light beam goes to the center of the
The angle formed by and is 19 °.

As is clear from the above, in this embodiment, the incident angle on the reflecting member 10 is set to be 19 ° to 71 °.

Further, in order to shorten the entire optical path (the total of the part α on the axis A and the part β on the axis B) to miniaturize the whole, the diameter of the opening of the reflecting mirror 11a of the light bulb with a reflecting mirror 11 and Bulb with reflector 1
The light collection distances (working distances) from the light emitting part of 1 to the light collection point are set to be substantially equal.

The reflecting member 10 has a reflecting surface in the direction of the light collecting surface 9g, and in this embodiment, it is a cold mirror for cutting the heat ray component of the light beam. The cold mirror is called a heat ray transmitting mirror and is coated with a dielectric multilayer film.

The 50% transmission wavelength of the dielectric multilayer film is generally set near 750 nm, but the incident angle is about 20 ° to 70 ° as in this embodiment.
In this case, the transmission wavelength shifts to the shorter wavelength side as the incident angle increases, which causes a decrease in reflected visible light. Therefore, in this embodiment, the thickness of each vapor-deposited film of the dielectric multilayer film formed by vapor deposition is uniformly changed, and the transmission wavelength shifts due to the difference in the incident angle to the cold mirror. By canceling, the effect that the parallel light flux is incident and the same transmission wavelength characteristic is obtained at any part of the reflecting member 10 is obtained. In order to make the film thickness have a uniform change, a method of inclining the member to be vapor-deposited by a certain angle with respect to the vapor deposition target or interposing a metal net having a light and shade mesh is used. Even with a normal cold mirror with a constant film thickness, the setting around 750 nm above 800
If it is set to 850 nm, the amount of visible reflected light can be increased without being significantly affected by the reflection of heat ray components. (According to the applicant, an increase of about 15 to 20% can be expected.) Note that reference numeral 20
Is a screw hole formed in the light collecting member 9, and the screw 21 is screwed in to fix the cylindrical mirror 6.

In the above configuration, when the light bulb 11 with a reflecting mirror is turned on, the light is incident on the inside of the light transmission body 2, and the linear light is emitted from the slit 5a. At this time, the luminous flux emitted from the electric bulb 11 with a reflecting mirror is condensed into a conical shape by the condensing member 9, is reflected by the reflecting member 10, and is bent by 90 °. this
The light beam bent by 90 ° is incident on the tip surface 2a of the optical transmission body 2.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Since the diameter of the opening of the reflector of the light bulb with a reflector is set to be substantially equal to the working distance, the light collecting member can be made smaller and lighter.

Since the diameter of the aperture of the reflector of the bulb with a reflector and the working distance are set to be approximately equal, the total optical path is shortened, and the position deviation of the filament of the bulb with a reflector and the curvature of the reflector of the bulb with a reflector are inaccurate. The spread of the beam waist of the condensed light flux caused by the above is reduced, the efficiency of narrowing the light flux is improved, and the incident angle of the condensed light flux is in the range where the loss is not increased.

Since the condensing surface of the condensing member has a conical shape, the shape of the reflecting member can be downsized, and therefore the manufacturing cost of the reflecting member can be reduced.

If the reflecting member is a cold mirror and the spectral distribution characteristics are changed uniformly, the visible light loss (transmission ratio to the rear of the reflecting member) due to the difference in the incident angle of the light flux on the reflecting member is reduced, so the amount of usable light is reduced. Increase.

[Brief description of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view and a second view.
1 is a side view of FIG. 1, FIG. 3 is an exploded perspective view, and FIG. 4 is a schematic explanatory view of a main part. Explanation of symbols 1 ... Diffusion draft, 2 ... Optical transmission body 3 ... Tube 4 ... Reflected light diffusion ceramic sheet 5 ... Linear light emission slit surface 5a ... Slit, 6 ... Cylindrical mirror 6a. Tip part, 6b ... End part 7 ... Cap, 8 ... Seal member 9 ... Light collecting member, 9a ... Bottom part 9b ... Side part, 9c ... Screw hole 9d ... Washer, 9e .. 9f …… Fixing spring, 9g …… Focusing surface 9i …… Through hole, 9j …… Oval hole 9k …… Screw hole, 9l …… Washer 9m …… Screw, 9n …… Locking member 9o …… Step section , 10 …… Reflecting member 11 …… Reflecting light bulb, 11a …… Reflecting mirror 20 …… Screw hole, 21 …… Screw

Claims (2)

[Scope of utility model registration request] 1. A reflector-equipped bulb in which a bulb is arranged at a first focal point of an ellipse forming the spheroid of a concave reflector having a spheroidal surface, and light emitted from the reflector-equipped bulb is set to 90. A reflecting member that bends; an optical transmission body that has an incident end that is disposed at a second focal point that is a converging point where the light from the spheroid is bent and connected by the reflecting member; A conical light-collecting member that forms an optical path from the emission end of the light bulb with a mirror to the reflecting member, and the diameter of the opening of the light bulb with a reflector and the light-emitting portion of the light bulb with a mirror to the light-collecting point. An illuminating device characterized in that the light collecting distances of the light emitting devices are made substantially equal to each other. 2. The reflection member is a cold mirror that is coated with a dielectric multilayer film and reflects only visible light.
Claim 1 of the utility model characterized in that the effect of shifting the transmission wavelength due to the difference in the incident angle with respect to the cold mirror is canceled out by continuously changing the film thickness of each layer of the vapor deposition film. Lighting equipment.