JPH0617048Y2 - Indicator instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an indicator instrument for indicating a traveling state of a vehicle, a ship, an aircraft, etc. The present invention relates to an indicating instrument that shakes a beam of light to give an instruction.

[Prior Art] A conventional indicating instrument of this type has, for example, a structure as shown in FIGS. 3 and 4. In the figure, 1
Is a laser light emitting unit, 2 is a laser mirror for changing the optical path by reflecting at a high rate (usually 99.5% or more) with respect to a specific wavelength and incident angle of the laser light, and 3 is an optical path for scattering the laser light inside the optical path 5. A diffuser plate 4 made of transparent acrylic or the like in which fine particle pigments are mixed so as to be visible to the naked eye, 4 is a dial plate formed around the diffuser plate 3 and having a scale or a character 4a printed thereon, 6
Is the laser mirror 2 and the rotary pointer shaft 7 of the instrument movement 8
A holding stud 9 for integration with a driving circuit of the instrument movement 8 is for rotating the pointer shaft 7 in response to an input signal such as a traveling speed signal.

Reference numeral 10 is a drive circuit for causing the laser unit 1 to emit a laser beam, and 11 is arranged behind the diffusion plate 3 and the dial plate 4, for example, a direction indication display 11a and a rotation speed display 11b.
And a light diffusing plate 13 for illuminating the back of the positive type liquid crystal display plate 11 substantially uniformly by the light from the illumination lamp 12 behind the positive type liquid crystal display plate 11. It is provided. 14 shows an instrument housing.

And in such an indicating instrument, the positive type liquid crystal display panel 1
By driving 1 and turning on the illuminating lamp 12, the displays 11a and 11b of the positive type liquid crystal display panel 11 are positively displayed, and at the same time, the instrument movement 8 is driven according to the instruction input, whereby the reflection of the laser mirror is reflected. The laser light 5 emitted from the laser light emitting unit 1 is radiated into the diffuser plate 3 while changing the angle, and as a result, it is reflected by the fine particle pigment mixed in the diffuser plate 3 and shown in FIG. Thus, the pseudo pointer 5 which shines linearly is formed.

[Problems to be solved by the invention] In such a conventional indicating instrument using laser light,
In particular, in the diffuser plate 3, the laser beam generated from the laser light emitting unit 1 is scattered in the diffuser plate 3. Therefore, for example, when the emission output of the laser beam is a low output of 2 to 3 mw, a bright atmosphere is generated. Below, there was a problem that the laser beam light scattered in the diffusion plate was hardly visible, the brightness of the tip of the laser beam was unclear, and it was difficult to confirm the indicated value, that is, the visibility was poor.

[Means for Solving the Problem] The present invention has been made in view of the above-mentioned conventional problems, and a laser beam path that allows the inside of the diffuser plate to pass through, for example, 90 in the forward direction is provided at the peripheral portion of the diffuser plate. A 45 degree cut surface for refracting the laser beam is formed, and a low transmittance filter that transmits strong reflected light in the forward direction but absorbs weak reflected light is provided in the forward optical path of the laser. An object of the present invention is to provide an indicating instrument capable of enhancing the displayability (visibility) of a pseudo pointer by light.

[Embodiment] The present invention will be described in detail below based on the embodiment shown in FIG. 1 and FIG. 2. The same parts of the structure of this embodiment and the structure described in the conventional example are the same as those in the conventional example. The same reference numerals are used and the description of the same structural parts is omitted.

That is, the present embodiment has a feature in the display plate structure of the indicating instrument that forms the pseudo pointer by the laser light, and the other move structures and the like are omitted as in the prior art.

In FIG. 1, reference numeral 21 denotes a display plate, and this display plate 2
1 is a plate material formed in a substantially semi-circular shape,
Is formed of a transparent resin, but the peripheral portion of the display plate 21 forms a display portion 23 having scales, numerical values, etc. 22 and the other portion is formed in a pointer display portion 24. . Inside the pointer display portion 24, the laser beam emitted from the laser emitting unit 1 is received and reflected,
A fine particle pigment for displaying the pseudo pointer 25 on the surface of the display plate 21 is provided. The pointer display section 2
4 at the boundary between the display unit 23 and the pointer display unit 24, a reflecting surface 2 of approximately 45 degrees for reflecting the laser beam passing through the pointer display unit 24 toward the viewer.
6 is formed. Further, on the front surface of the reflecting surface 26, that is, the front surface of the peripheral edge of the pointer display portion 24, a low transmission filter 27 having a projection width (d) for passing the laser light reflected toward the viewer is attached. . If the low-transmission filter 27 is more specifically extended, the filter can pass the strongly reflected light of the laser light reflected forward by the reflecting surface 26, but the reflecting surface 26.
The weakly reflected light reflected by is a low transmission filter with a characteristic of being blocked. The width of the low transmission filter 27 (d)
Is preferably approximately equal to the plate thickness (t) of the display plate 21.

Therefore, according to this embodiment, the laser light emitted from the laser emitting unit 1 is reflected by the reflection mirror 2 and is introduced into the diffuser plate 24, and is diffused by the fine particle pigment mixed in the diffuser plate 24. Within the area (1) of
Is displayed. The tip portion of the pseudo pointer 25 is reflected by the reflecting surface 26 and refracted toward the viewer. Of the refracted reflected light, the weak light diffused by the reflecting surface is reflected by the low transmission filter 27. Only the strong beam light that is absorbed and not transmitted forward and is reflected by the reflecting surface passes through the low-transmission filter 27.
Since the laser beam transmitted through is displayed only with a strong luminance in a fine and clear manner, the indication value by the tip portion of the pseudo pointer 25 becomes clear, and the indication characteristic is enhanced.

[Advantages of the Invention] As described above, the present invention has the movement 8 having the rotating shaft 7 that rotates by a predetermined angle according to the measured amount, the display plate 21 indicating the measured amount, and the light source 1 that emits a beam of light. The light source 1 is provided on the rotary shaft 7 and rotates together with the rotary shaft 7.
In an indicator instrument including a reflection optical means 2 for making light from the side face of the display plate incident in the direction of the display plate 21, a peripheral surface of the display plate 21 is provided with a reflection surface for reflecting the light in the forward direction. According to this, the light source 1 is provided with the low light transmittance filter 27 which is provided with 26 and which transmits the strongly reflected light to the front and blocks the weakly reflected light.
The beam-like light emitted from the light passes through the inside of the display plate 21 to form the pseudo pointer 25. In particular, at the tip display portion of the pseudo pointer 25, the filter 27 having a low transmittance is used.
Since only the strong beam light reflected by the reflecting surface 26 is transmitted through the low transmission filter 27, the laser light transmitted through the low transmission filter 27 is displayed with only its strong luminance clearly. Therefore, the value indicated by the tip of the pseudo pointer 25 becomes clear, and the effect of improving the indicating characteristic can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an indicating instrument according to the present invention, FIG. 2 is a front view thereof, and FIGS. 3 and 4 are sectional views and front views of a conventional example. 21 ... Display plate, 22 ... Scale value, etc. 23 ... Display unit, 24 ... Pointer display unit 25 ... Pseudo pointer, 26 ... Reflective surface 27 ... Low transmission filter

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft that rotates a predetermined angle in accordance with the quantity to be measured.
Movement (8) having (7) and display plate showing the measured amount
(21), a light source (1) that emits a beam of light, and the rotating shaft
Reflective optical means (2) which is provided in (7) and rotates together with the rotation shaft (7) to make the light from the light source (1) incident from the side surface of the display plate toward the display plate (21). In the indicating instrument equipped with, on the peripheral surface of the display plate (21), with a reflecting surface (26) for reflecting the light in the forward direction, while passing the strongly reflected light to the front, weakly reflected light is A low light-transmitting filter that blocks light
An indicating instrument characterized by having (27).