JPH0113602B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a focus inspection device such as a signal searchlight,
More specifically, the present invention relates to a focus inspection device for when the light emitting part of the light source cannot be seen from the side because the sputter part is deep in a signal search light using a light bulb with a sputter.

Since searchlights are used only at night, the beam can be adjusted by looking at the beam and making it wider or narrower depending on the purpose of illumination. Signal searchlights emit and respond to signals as needed, both during the day and at night. Of course, irradiation is also performed at night.

Optical signals are mainly used within harbor curves or in areas where wireless use is prohibited. Even if it is turned on during the day, the light beam cannot be seen by the caller, but it is natural that the caller will be able to make a call under the best conditions. Furthermore, when the light bulb is replaced, the filament may be misaligned due to manufacturing errors in the light bulb, making it impossible to obtain the maximum luminous intensity. Therefore, there is a need for a focus detector that can tell whether the light bulb is at the focal point of the reflector even during the day.
Focus telescopes have existed for a long time. The principle is divided into (a) a direct visual method in which the light source is viewed from the side, and (b) an indirect method in which a pointer that moves along with the light source is seen, but each method has the following drawbacks.

In method (a), the bulb's stem hides the filament, making it impossible to obtain a clear image. Also, in a light bulb with a sputter, if the sputter is deep, the filament cannot be seen at all, making it impossible.

In method (b), each time a light bulb is replaced, it is necessary to readjust the autopsy instrument to account for manufacturing errors in the light bulb filament in order to send an effective signal. In addition, the two-lamp type has disadvantages such as not being able to accommodate differences in the dimensions of the individual filaments, and the pointer getting in the way when changing the position of the bulb, making it impossible.

The present inventor has proposed Utility Model Registration No. 1160342 (Utility Model Registration No.
16614 and Utility Model Application No. 49-41793), but there was a problem in that it could not be applied when there were obstacles such as filament stems around the light source.

In order to solve this problem, the present invention was invented as an improved invention of the above-mentioned device, and the present invention provides a focus inspection device for inspecting a signal search light by installing a focus inspection device inside the lamp body. A prism, such as a right-angle prism or a pentaprism, which changes the optical path in a right-angled direction, is arranged near the periphery of the mirror to allow the vessel to receive the light rays from the light source reflected by the mirror. Based on this,
Even if there are obstacles such as filament stems around the light source, accurate autopsy can be performed.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the figure, 1 is the lamp body, 2 is the rear cover, 3 is the reflector, 4,
5 is a light bulb, which is the light source of a general signal searchlight.
As shown in the figure, light bulb 4 indicates a shallow sputter, and light bulb 5 indicates a deep sputter. The filament 4' and the stem 4'' are common to the bulbs 4, 5. It is assumed that the bulbs can be focused by a known method.

A right-angle prism 6 is arranged near the periphery of the reflecting mirror 3 at a predetermined position so as to receive the light beam from the light source.
is secured to the autopsy body 12 of the focusing autopsy device 23 by using small screws with a presser plate 8 via the gasket 7 . On the other side of the right angle prism 6, a presser plate 9 is fixed with a small screw to prevent the prism from falling off. The medical examiner body 12 has a through hole, and a partition wall 10 with a pinhole is placed on the right-angle prism side of the through hole, and there is a very small diameter hole in the center, which causes a pinhole effect when light passes through it. The trapezoidal prism 11 is housed in the through hole of the autopsy body 12, and a screen 20 and a colored glass (filter) 21 are brought into close contact with the other end and fixed with screws using a retaining ring 22. A medical examiner mounting frame 13 is fixed to the lamp body 1 with rivets, and the medical examiner body 12 is assembled within the frame. 17 is an O-ring, 18 is a transparent glass, and 16 is a screw cap with a window, through which the filament projected onto the screen 20 from the central window can be viewed as an image. Since the colored glass 21 serving as the filter is engraved with cross lines, the position of the light source can be confirmed. The trapezoidal prism 11 is for inverting the inverted image coming out of the pinhole 10' into an erect image. For the same purpose, the pentaprism 24 shown in FIG. 5 may be used, or the convex lens 25 shown in FIG. 4 may be used. In this case, the screens are the first screen 26 and the second screen 2.
Use 7.

The base 15 of the autopsy body 12 has a spherical shape,
It is in contact with the retaining ring 14 which has a spherical seat adapted to this, and its direction can be adjusted by adjusting the tightening of the retaining screw ring 19 and swinging it.

Next, the optical system shown in FIG. 2 will be explained.

When the center point of the light source is at the focal point of the parapet surface reflector, the ray from F is incident and refracted at point A of the reflector and reflected in the direction of ', which is parallel to the optical axis. The light beam incident on the right angle prism 6 is totally reflected at point A'' and passes through point D, but since the image is inverted, it passes through the trapezoidal prism 11 and is inverted to become an upright image. The light beam is projected onto a screen 20, and a colored glass 2 serving as a filter is used.
The position of the image in this case is shown in Figure 3a. Next, when the light source moves to point B, the light projected onto B' of the reflecting mirror is totally reflected at B'' and passes through point D, but this ray also becomes an inverted image.
(For convenience, move point D to point D' to find the intersection with the total reflection surface of right angle prism 6.) Next, when the light source moves to C, the light rays are reflected by the reflecting mirror.
It is reflected at C', concentrated at point D', enters the right angle prism 6, is totally reflected at point C'', and passes through point D. Since this ray is also an inverted image, it is inverted using the trapezoidal prism 11. The image projected onto the screen 20 and passed through the colored glass 21 in this way is an erect image as shown in Figures 3b and 3c, but in case of B, the image is If the light source moves away from the reflector, it will move to the left, and if it is C, it will move to the right of the crosshair, so if the light source moves away from the reflector, it will move to the left, and if it approaches the reflector, it will move to the right, so the reality and the image will match. An autopsy can be performed accurately.In addition, the focus autopsy device 2
Even if the filament itself cannot be seen from the mounting position 3, a prism that changes the optical path to the right angle direction, such as a right angle prism or a pentaprism, is used to allow the focusing instrument 23 to receive the light rays from the light source reflected by the reflector. Another feature of the reflector is that it can be seen by placing it near the periphery of the reflector.This allows the filament of the light source to be easily recognized even if there are obstacles such as the stem of the light bulb around the light source. Since the shape is clearly visible, it is easy to match and the accuracy of the autopsy is high.

FIG. 6 shows another embodiment of the present invention, in which a light beam from a light source (4 or 5) is directed to a predetermined position near the periphery of a reflector 3 in a light body 1 such as a signal search light. A right-angle prism 6 is arranged so as to receive the light, and a partition wall 10 with a pinhole is placed between the right-angle prism 6 and a viewing window on the side wall of the lamp body, and a light source image by the light rays emitted from the pinhole 10' is displayed on a screen 20. The light source image is projected through a filter 21 that is in close contact with the light source, and the light source image is dimmed and then viewed through the viewing window. In the illustrated example, the light source image is an inverted image, so a display to that effect is provided near the viewing window.

[Brief explanation of drawings]

The drawings show an embodiment of a prism-type focus inspection device for a signal searchlight etc. according to the present invention,
FIG. 1 shows the structure of the optical system of the searchlight and the prism-type focusing device, and FIG. 2 is a configuration diagram showing the position of the light source and an outline of catadioptric refraction of the light beam. Figure 3 A, B and C,
Figures 3a, b, and c are explanatory diagrams showing changes in the light source position and changes in the image position based on these, respectively. Figure 4 is a configuration diagram of an example using a convex lens as the optical system. Figure 5 is a pentaprism. Fig. 6 is a partially cutaway cross-sectional view of another embodiment, 1 is a light body, 2 is a rear cover, 3 is a reflector, and 4 is a light bulb (a type with a shallow spatter). , 4' is the filament of the light bulb, 4'' is the stem of the filament, 5 is the light bulb (deep sputter type), 6 is the right angle prism, 7
is a packing, 8 is a holding plate, 8' is a machine screw, 9 is a holding plate, 9' is a machine screw, 10 is a partition plate with pinholes,
10' is a pinhole, 11 is a trapezoidal prism, 12
13 is the autopsy device body, 13 is the autopsy device mounting frame, 14 is the holding ring, 15 is the base, 16 is the screw lid with window, 17 is O
ring, 18 is transparent glass, 19 is a retaining screw ring, 20 is a screen, 21 is a colored glass (filter), 22 is a retaining ring, 23 is a focusing device,
24 is a pentaprism, 25 is a convex lens, 26 is a first screen, and 27 is a second screen.

Claims (1)

[Scope of Claims] 1. In a focus inspection device for performing inspection by installing a focus inspection device in a light body such as a signal searchlight, the focus inspection device is configured to receive light from a light source reflected by a mirror surface reflector. A focus inspection device characterized in that a prism such as a right-angle prism or a pentaprism for changing an optical path in a right-angled direction is disposed near the periphery of the object surface reflecting mirror. 2. In the focus examination device according to claim 1, the right angle prism or pentaprism, the required optical system of the focus examination device, the screen, and the filter are arranged in one examination device body, and A focus examination apparatus characterized in that the examination instrument body has a spherical seat so that the direction with respect to the light source can be adjusted.