JPS62108220A - Shutter array - Google Patents

Abstract

PURPOSE:To reduce electric power consumption by electrifying an oscillation diaphragm having a specular surface existing in an optical path form a light source to a photosensitive surface or impressing a voltage thereto and applying electrostatic attraction force or electrostatic repulsive force between said diaphragm and another electrode facing the same in proximity thereto. CONSTITUTION:Light emitted from a fluorescent tube 1 is collected by a condenser lens 2 and is stopped by a collimator 2a. The light is reflected by the movable electrode 3 of a shutter element and is irradiated through a lit 5 to photosensitive agent coated paper 6. A roller 7 for a platen to support the paper is provided. A weak AC power is applied to the electrode 4 so that the movable electrode 3 is kept slightly oscillated, then the deviation in the neutral position of the optical axis and the movable electrode is negligible and the shutter array is made advantageous for a change of lapse of time. The two electrodes attract to or repulse from each other to deform the movable electrode 3 when the voltage is impressed to the electrode 4 or the movable electrode 3 or said electrode is electrified. As a result, the optical path changes from the state (a) to the state (b) or (c) and the light no longer passes the slit 5, so that the photosensitive agent coated paper 6 is not exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shutter array used in a line head of an optical printer or the like.

[Summary of the invention]

In a printer that uses light, a mirror surface that reflects light is provided between the light source and the photosensitive surface, and by electrically vibrating this mirror surface, the amount of light irradiated from the light source to the photosensitive surface is modulated.

[Conventional technology]

Conventionally, optical printers include serial scan type laser scanning type, and line type such as liquid crystal type (LC type) and light emitting diode type (I, !IiD type).

[Problem that the invention seeks to solve]

However, the laser scanning type has the disadvantage that the optical system is precise, expensive, and large. Furthermore, the LKI1 type has the disadvantage of high power consumption, and there is a limit to the wavelength of light that can be emitted. Although the LCD type uses low power, it has the disadvantage that the contrast decreases depending on the wavelength of the light.

[Means for solving problems]

In order to solve the above problem, a new method 'fc' is proposed. In other words, it charges or applies a voltage to a diaphragm with a mirror surface in the optical path from the light source to the photosensitive surface, and applies electrostatic attraction or repulsion between it and another electrode that faces and is close to it. It is.

[Effect]

With the above configuration, the amount of light irradiated onto the photoreceptor can be modulated by changing the optical path that reflects the light from the light source.

〔Example〕

The present invention will be explained below based on the oral aspects of Examples. FIG. 1 shows the mechanism of a printer using the present invention.
Collect the light emitted from the condenser lens 2, and collimator 2
The light is stopped by α, reflected by the movable electrode 3 of the shutter element, passes through the slit 5, and is irradiated onto the photosensitive agent coated paper 6. 7 is a platen roller that supports the paper. In addition, if a weak AC voltage is applied to the n-pole 4 and the movable electrode 8 is slightly vibrated, the deviation of the optical axis and the neutral position of the movable electrode can be ignored, and the zero-order When a voltage is applied or charged to the movable electrode, the two electrodes attract or repel each other, causing the movable electrode at to deform. As a result, the optical path changes from state α to state b or C. Then, the light no longer passes through the slit 5, and the photosensitive agent-coated paper 6 is not exposed to light.Instead of the photosensitive agent-coated paper, the present invention also uses a photosensitive roller whose surface is coated with an optical conductor to develop and transfer toner. include.

Further, the distance d between the movable electrode 3 and the electrode 4 is made sufficiently smaller than the distance between adjacent shutter elements, so that mutual electrostatic interference between the shutter elements can be almost ignored.

FIG. 2 shows one of the principles of the present invention, and is of a foil electroscope type. The switch 8 is discharged with Pl, held with i, and charged with P. Electrode 9 generates a repulsive force when charged, and corresponds to movable electrode 8 and electrode 4 in FIG. FIG. 2(A) shows a holding state, and FIG. 2(B) shows a charging state. 10 is a high voltage power source. By using the principle shown in FIG. 2 in this manner, the optical path can be changed to the light path shown in FIG. 1.

FIG. 3 shows another principle of the invention, 1
Reference numeral 1 denotes a movable electrode, which is one element of a comb-shaped shutter array whose at least one surface is mirror-finished.
12 is another opposing electrode, and control signal source 13
Gara'? ! An independent signal is provided for each pole. 14 is an insulating spacer. 15 is an insulating and dielectric layer.

16 is a substrate. 17 is a damper for widening resonance.

When a voltage is applied to the electrode 12, the movable electrode is electrostatically attracted. In this way, by using the principle shown in FIG. 3, the optical path can be changed to the optical path O in FIG. 1.

FIG. 4 is a plan view of the movable electrode 11 in FIG. 3. 11 has a width equal to the maximum width for printing, but only a portion of it is shown in FIG. Further, the formation into a comb tooth shape is performed by a method such as etching, and is formed using a method that does not deteriorate the orientation of the surface by 1 degree.

〔effect〕

As described above, the present invention has the following features: 1) Since minute charges or electric fields are used, power consumption is extremely low.

2) Since reflection is used, the attenuation of light due to the shutter is small over all wavelengths, and furthermore, it is a method that does not absorb light when it is blocked. Therefore, the use of light is efficient, and the shutter does not generate heat even with a large amount of light. As a result, high-speed printing is possible even on photosensitive paper using near-ultraviolet rays and low-sensitivity photopolymerized microcapsule ink.

3] With the method shown in FIG. 3, it is not necessary to adjust the orientation and surface direction of each element of the movable electrode, thereby improving the accuracy of the optical system and reducing manufacturing costs.

It has the above effects.

[Brief explanation of drawings]

The first quotient is an explanatory diagram showing the mechanism of a printer using the present invention, and the second diagram is an explanatory diagram of the principle of a peel-off voltage detector type shutter.
FIG. 3 is an explanatory diagram of the electrostatic attraction type shutter, and FIG. 4 is a plan view of the movable electrode 11 in FIG. 3. 16. Fluorescent tube 21. Condenser lens 80. Movable electrode 4, ML pole 66. Photosensitive agent coated paper 110. (1 other person) Figure 1: An explanatory diagram of the structure of the pushon of the present invention.

Claims (4)

[Claims] (1) A plurality of shutter elements each having a plate-like movable electrode having a mirror surface that reflects light and having one end fixed, and another electrode facing and close to the movable electrode; A shutter array characterized in that at least the movable electrode among the electrodes is controlled in charging or voltage application, and is driven by an electrostatic attractive force or a repulsive force. (2) A patent claim characterized in that the movable electrode group is formed in a comb shape on one plate and has the same potential, and a control signal is independently applied to the other electrode group facing each other. The shutter array according to item 1. (3) In the optical printer, the movable electrode is arranged in the optical path so that the photoconductor is exposed to light when the movable electrode is not pivoted, and the amount of exposure is reduced or no exposure is made when the movable electrode is driven. A shutter array according to claims 1 and 2, characterized in that: (4) By connecting an AC voltage source with a frequency higher than the number of dots to be printed per unit time to the electrode and generating periodic fluctuations in the optical axis, the optical axis can be changed due to a shift in the neutral position of the movable electrode. The shutter array according to claims 1, 2, and 3, characterized in that the influence of deviation is suppressed.