JPS5883811A - Illumination device for copying machine - Google Patents

Abstract

PURPOSE:To adjust the quantity of light quickly and properly with a simple constitution, by providing a mechanism which moves a lamp or/and a condenser lens along the optical axis. CONSTITUTION:A main lens 3 and a condenser lens 4 are fixed, and an eccentric cam 9 is rotated by a driving motor, and a lamp 2 fixed to a slider 5 is moved along the optical axis by the quantity of cam lift corresponding to this rotation. Since the luminous flux which is emitted from the lamp 2 and is incident to the main lens 3 through the condenser lens 4 is changed, the obtained quantity of light is changed. Thus, the quantity of light is adjusted easily and quickly with a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illumination device for a copying machine using a light-emitting or condensing lens.

In the conventional copying machine's illumination device, the two methods for obtaining the highest amount of light are (1) controlling the light source lamp voltage and (2) varying the aperture of the lens. and (2) a slit is placed in the exposure area of the original drum and this is defined as q*.

However, in method (1) 9 above, when the voltage is lowered to reduce the amount of light, the run fC) light emission becomes unstable.
When using an f7 lamp, there may be a problem that the wave number distribution of the starting point changes drastically due to a change in color temperature, resulting in a drop that is not practical.

In the method (to) above, making the stranglehold itself dense will lead to high enemy strikes, but it will require control of the stranglehold itself (due to the expansion effect). There are 6 problems.

In addition, in the method (3) above, the amount of peripheral light deteriorates,
It is customary to widen the slit width in some local areas6>
, the mechanical structure becomes very complicated], and in general, only manual replacement or several steps of carbonization are required. It is difficult to obtain the optimum light intensity, and this must be corrected with other auxiliary devices. I can't help it.

The purpose of the present invention is to Next 'Technology O Challenge Point K
In view of this, it is possible to adjust light intensity changes very easily, quickly, and precisely with a very simple configuration, and it is possible to adjust the amount of light very easily, quickly, and precisely.
Our goal is to provide an illuminating device.

According to the present publication, the purpose of this e is to adjust the light amount in an illumination device equipped with a lamp and a round condenser lens t that condenses light from the run 1 into the main lens. Ninth said run l.

Along the optical axis through the condenser lens and the main lens, the above Wf and the above condenser! This can be achieved by providing a light amount adjustment mechanism that increases one or both of -len and f□.

Next, an embodiment of the present invention will be explained based on the accompanying drawings.

Figure Is1 is a schematic plan view showing the configuration of a light device in a copying machine as an embodiment of the present invention.

Figure 2 is a schematic elevation view. The illumination device of this embodiment includes a run f2 having a filament l, and a run f2 having a filament l.
It is equipped with a round condenser reno T4 that focuses the light from the main reno je3 onto the main reno je3.

j! According to the present invention, y f2 u, sly 15
It was taught to me by ``Kunpu noketto'' and is attached to 6.

The slide 15 is held by four flocks 7'k
It is adapted to slide along the t-id 14-8.

j! The slide IsK is associated with a drive motor 1G having an eccentric cam 9, and the slide I5 is connected to a drive motor 1G having an eccentric cam 9.
and slider 5 and OfMIK installed splinder 1
2, it is constantly pressed against the eccentric cam 9. When the motor 1G is rotated, the eccentric cam 9 rotates, and the slide 15 corresponds to the rotation by the amount of the cam lit.Therefore, the filament 1 of the run f2 has an optical axis 13Ka that passes through the run f2, the condenser Leno i4, and the main lens 3.
It is now being moved. ζ Then, Sly 1
5, Tsurotsu It, t I P-f-8, heartbreak cam 9, 毫-Yu 1G%-211 and eccentric Snorinda 18, light amount lll
It constitutes the l1 mechanism.

Next, a description will be given of how the light amount is adjusted by a light amount adjusting mechanism such as a screwdriver with reference to FIGS. 51m1 and 1s4.

2nd tlJF1, main reno JP3 and condensation fee-v
When fixing the engine je4 and moving the run f snow 04 along the original axis x 3km, the ramp point is located at 'sP'.

At the main reno t30 principal point (also #i position) 8A
K lens, +fO effective 0 (II hole), the filament 1 is imaged 1^ and shows the %/% linear state.

In this foreshadowing, the filament 10 imaging t on the main v y / 3 is ^. Therefore, the amount of fake party of run f-tomi is 1
00-Input to main reno JP3. Now motor 1
Apply the adjustment signal to 0, rotate the deviation cam 9, and slide/
Move S and move run f20 filament 1 to origin L0
Fig. 4 shows a good condition with only the distance scratch located at the rear. In proportion to this displacement JK, the image 1 at the principal point 3^ of the main lens 3 of the filament 1
The size of s changes to AH, ^. 〉Creating AI relationships)
In other words, it is possible to achieve the same amount of light as ``Isase-Ku''.

In the above-mentioned embodiment, the light intensity is adjusted by moving the run f2 along the optical axis 13, but by moving the condenser array yje4 along the original axis 13, the condenser array: /14 and the main array /14 are adjusted. By varying the distance between the main lens 3 and the main lens 3, it is possible to greatly reduce the amount of light (I4#), and the amount of light can be greatly reduced. Another example is:
It may be a light amount adjustment mechanism that moves the content lens along the optical axis, or it may be a light amount adjustment mechanism that moves both the condenser lens and the lens along the optical axis.

As described above, the present invention is equipped with a light amount S* mechanism that moves one or both of the rung and the condenser lens along the light, and the rung voltage can be set at a constant voltage or within a specific range. It is possible to adjust the light intensity with the convenience of a simple design, and therefore, it can be used by regulating the required number of patterns.It is possible to perform highly efficient and linear control, and has a relatively simple structure. The advantage is that adjustments can be made quickly.

[Brief explanation of the drawing]

Figure #11 of the attached drawings is a schematic diagram showing the configuration of an illumination device in a copying machine as an embodiment of the present invention. 4al is a rounded outline explaining the principle of light amount adjustment in the illumination device KsI of FIG. 1. 1...filament, meaning...lamp, 3.-mayy
Lens, 4-bit condenser lens, 5-, slide 1
19... Deviation cam, lO... Motor, 12-... Deviation S/D, 131-... Optical axis

Claims (1)

[Claims] An illumination device for a good copying machine equipped with a round condenser lens that condenses O light from a lamp and a crease onto the main body. Then, along the optical axis through the light quantity -*o*me, the run f, the co/den t-lens and the main lens, the light quantity -*o*me, the condenser! - A lighting device characterized by being equipped with a light amount adjustment mechanism that allows one or both of the lights to be moved.