JPH0628646Y2 - Proportion reading microscope in surveying machinery - Google Patents

Description

[Detailed Description of the Invention] [Field of Use of the Invention] The present invention relates to a degree reading microscope for reading the scale of a degree plate in a surveying machine such as a level or theodolite.

"Problems to be solved by conventional technology and device" The conventional degree reading microscope of a surveying machine uses aluminum vapor deposition, etc. on the scale surface of the lower surface of the glass protractor (since the top surface is a dust surface, dust will get on it). A reflecting surface is provided, and the incident light from the daylighting window is first transmitted through the half mirror and then reflected by the reflecting surface on the lower surface of the protractor plate, and the reflected light is further reflected by the half mirror to form a reading optical system. It is designed to read and read.

However, since the half-mirror is used as the reflection mirror that reflects the light toward the reading optical system, the amount of light incident from the lighting window is 1/2 for transmission and 1/2 for reflection, so it is finally 1 It is attenuated to / 4, and this loss of light makes it dark and disadvantageous in reading the graduation scale.

In addition, since the reflective surface is provided on the scale surface of the protractor board, it is necessary to pay close attention so that the reflective surface is not scratched (the scratched portion is observed as a black scratch because the illumination light is absorbed). There is a difficulty in handling the protractor.

[Means for Solving Problems] In order to solve the above-mentioned conventional problems, the present invention has a conical shape for reflecting incident light from a lighting window in the direction of a transparent glass protractor below a transparent glass protractor. By providing the reflecting surface over the entire circumference, the illumination optical path of the protractor plate can be provided on a path different from the reading optical path, so the reflecting mirror placed in the reading optical path can be a total reflection mirror, and a half mirror. Since there is no light loss like the above, the proposition reading microscope is proposed which enables the prominent scale to be observed brightly and allows the protractor plate to be handled very easily.

"Embodiment" An embodiment of the present invention shown in the drawings will be described below.
A peripheral portion 3 ′ of the protractor rotating ring 3 extends below a transparent glass protractor plate 2 installed on a pedestal 1 of a surveying machine for level or the like, and a conical reflecting surface 4 is provided on the upper surface of the peripheral portion 3 ′. The incident light taken from the daylighting window 5 is reflected in the direction of the protractor plate 2.

The light reflected by the conical reflecting surface 4 passes through the protractor board 2 and then
It is reflected by the total reflection mirror 6, and a graduation image is formed on the focusing screen 9 by the projection lenses 7 and 8.
It is designed to be observed and read by 0 and 11.

The position of the reading optical system such as the daylighting window 5 and the total reflection mirror 6 changes with respect to the protractor board 2 and the reflection surface 4 as the main body rotation portion 12 rotates, but the reflection surface 4 Is a conical shape and is provided over the entire circumference,
It is possible to secure the illumination of the protractor board 2 regardless of the direction.

[Advantage of the Invention] As described above, according to this invention, the conical reflecting surface for reflecting the incident light from the lighting window in the direction of the transparent glass graduation plate is provided below the transparent glass graduation plate over the entire circumference. Therefore, the illumination optical path of the protractor can be provided in a different path from the reading optical path, and since a total reflection mirror can be used as the reflection mirror, there is no attenuation of the light quantity and the incident light from the light collection window is effective. In addition to being usable, it is not necessary to provide a reflecting surface such as aluminum vapor deposition on the graduation plate graduation surface, the graduation plate can be handled very easily, and defective products due to scratches on the reflecting surface do not occur.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part showing an embodiment of the present invention, FIG. 2 is a perspective view showing an optical system of a protractor reading microscope of the present invention, and FIG. 3 is an optical system of a conventional protractor reading microscope. FIG. 1 ... Stand, 2 ... Prolonged board, 4 ... Conical reflecting surface, 5 ...
… Lighting window, 6 …… Total reflection mirror, 12 …… Main body rotating part.

Claims (1)

[Scope of utility model registration request] 1. An incident light from a daylighting window is provided below a transparent glass dividing plate having a division scale along a circumference centered on an axis of a rotating shaft of a main body rotating portion. A degree-reading microscope in a surveying machine, characterized in that a conical reflecting surface centering on the axis of the rotating shaft of the main body rotating portion is provided over the entire circumference so as to reflect in the direction of the plate.