JPH07181401A - Automatic light controllable device - Google Patents

Abstract

PURPOSE:To assure the stable light controllable effect of an automatic light controllable device over a long period of time while making the light quantity distribution of lens transmitted light without shielding this light by shielding members. CONSTITUTION:A lens plate 3 having plural pieces of cylindrical lenses 5 is supported via thermally expandable supporting members 4 by a transparent plate 2. The shielding members 6 are arranged within the optical path of the lens transmitted light where the optical path section is smaller than the optical path section of the incident light on the cylindrical lenses 5. If the quantity of the incident light on the automatic light controllable device 1 changes, the supporting members 4 expand or contract accordingly and the ratio of the shielding members 6 occupying within the optical path section of the lens transmitted light changes. The lens transmitted light progressing without being shielded by the shielding members 6 progresses while spreading after passing the light condensing regions. The lens transmitted light of another lenses 5 is, therefore, made incident on the regions where the lens transmitted light of the certain lenses 5 is not made incident.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic light control device.

[0002]

2. Description of the Related Art As a conventional automatic light control device, a shielding plate capable of shielding transmitted light of transparent glass is provided, and when it is necessary to reduce the amount of transmitted light which is not shielded by the shielding plate, the transmitted light is 2. Description of the Related Art There is known an automatic light control device that further includes a changing unit that changes an angular position of a shield plate with respect to a traveling direction of transmitted light so that a ratio of the shield plate in an optical path cross section increases. However, in this automatic light control device, transmitted light that travels without being blocked by the shield plate arrives, for example, in a room, a region where the transmitted light is incident and a region where the transmitted light is not incident are generated, That is, there is a problem that the distribution of the transmitted light amount becomes non-uniform in the room. In order to solve this problem, a light control glass provided with a liquid crystal element is provided, and the voltage applied to the liquid crystal element is controlled to control the light blocking action of the liquid crystal element, so that the light control glass is not blocked. An automatic light control device which controls the amount of transmitted transmitted light is known (Japanese Patent Laid-Open No. 2-16).
1091).

[0003]

However, since the liquid crystal material is inferior in heat resistance or light resistance, the light shielding effect may be gradually lost when the liquid crystal element is used for a long period of time, and therefore, in the above-mentioned automatic light control device. When the amount of transmitted light is controlled by the light shielding effect of the liquid crystal element as described above, there is a problem that a stable light adjusting function of the automatic light adjusting device may not be secured for a long period of time.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a plurality of lenses for condensing light are provided, these lenses are arranged in parallel with each other, and light incident on each lens is provided. Equipped with a shielding member capable of shielding the light transmitted through each lens whose optical path cross section is narrower than that of
Moving means for moving the lens or the shielding member so that the ratio of the shielding member in the optical path cross section of the lens transmitted light increases when the amount of the lens transmitted light that is traveling without being shielded by the shielding member should be reduced. Is further equipped. According to the present invention for solving the above-mentioned problems, a plurality of lenses for condensing light are provided, these lenses are arranged in parallel with each other, and the optical path cross section is more than the optical path cross section of the light incident on each lens. Is provided with a shielding member capable of shielding each lens transmitted light, and when the light amount of the lens transmitted light that progresses without being shielded by the shielding member is to be reduced, within the optical path cross section of the lens transmitted light. It further comprises an optical path changing means for changing the optical path of the lens-transmitted light so that the proportion of the occupying member increases.

[0005]

According to the first aspect of the present invention, the lens transmitted light that travels without being shielded by the shielding member travels while spreading after passing through the converging region, so that the region where the lens transmitted light of a certain lens does not enter. The lens-transmitted light of another lens is incident on. Also in the invention described in claim 2, since the lens transmitted light that travels without being shielded by the shielding member travels while spreading after passing through the condensing region, the lens transmitted light of a certain lens is not incident on other regions. The lens-transmitted light of the lens enters.

[0006]

1 and 2, 1 is an automatic light control device, 2 is a transparent plate fixed to a frame (not shown), 3
Denote lens plates supported by the transparent plate 2 via the support member 4, respectively. The transparent plate 2 and the lens plate 3 are each made of, for example, glass or resin such as acrylic resin. On the other hand, the support member 4 is made of a material having a positive coefficient of thermal expansion and constitutes a moving means. As shown in FIG. 1, the lens plate 3 is provided with five cylindrical lenses 5 arranged in parallel with each other. These cylindrical lenses 5 transmit light passing through each cylindrical lens 5 toward the transparent plate 2 (hereinafter referred to as lens transmission). (Referred to as light). In the embodiment shown in FIG. 1, the lens plate 3 is supported by the transparent plate 2 so as to be movable with respect to the transparent plate 2. Still referring to FIG. 1, a shielding member 6 having a light shielding effect is formed on the transparent plate 2 located below each cylindrical lens 5. As shown in FIG. 2, each shielding member 6 extends parallel to the direction in which each cylindrical lens 5 extends. The shielding member 6 is formed by a method such as vacuum film formation or spin coating.

FIG. 3 shows the case where parallel light is incident on the automatic light control device 1. When parallel light is incident on the automatic light control device 1, the lens-transmitted light L transmitted through the cylindrical lens 5 is condensed by each cylindrical lens 5, so that the lens-transmitted light L has a corresponding light-collecting area 7 while its optical path cross section is reduced. Proceed towards. In the embodiment shown in FIG. 1, since the lens 5 is composed of a cylindrical lens, each converging region 7 extends in a line parallel to the direction in which the cylindrical lens 5 extends (perpendicular to the plane of FIG. 3). It is composed of the area of the shape. The lens-transmitted light L that has passed through the condensing region 7 then advances while its optical path cross section increases, and the optical path cross section of the lens transmitted light L then becomes larger than the optical path cross section of the light when entering the cylindrical lens 5.

As shown in FIG. 3, each shielding member 6 is provided so as to be always located in the optical path of the lens transmitted light L located between the corresponding cylindrical lens 5 and the condensing area 7. Therefore, a part of the lens-transmitted light L is blocked by the blocking member 6. Referring to FIG. 4, which shows an enlarged cross-sectional view taken along the line IV-IV of FIG. 3, among the lens transmitted light L, the lens transmitted light L transmitted through the central portion of each cylindrical lens 5 is shielded by each shielding member 6. On the other hand, the lens-transmitted light L transmitted through the peripheral portion of each cylindrical lens 5 travels without being shielded by each shielding member 6 to form device transmitted light T.

The amount of light incident on the automatic light control device 1 is shown in FIG.
The temperature of the automatic light control device 1 rises when the temperature is higher than that shown in FIG. When the temperature of the automatic light control device 1 rises, the support member 4 expands, and as a result, the lens plate 3 is moved in a direction away from the shielding member 6. When the lens plate 3 is moved in the direction away from the shield member 6, each condensing region 7 approaches the corresponding shield member 6, and therefore the ratio of the shield member 6 in the optical path cross section of the lens transmitted light L increases. . As a result, the ratio of the lens transmitted light L shielded by the shielding member 6 is increased, and thus the light amount of the device transmitted light T is reduced. When the amount of light entering the automatic light control device 1 is large, the support member 4 is largely expanded and the light collecting region 7 is close to the shielding member 6. Therefore, when the amount of light entering the automatic light control device 1 is large, the lens is increased. The proportion of the shield member 6 in the optical path cross section of the transmitted light L increases, and as a result, the proportion of the lens transmitted light L shielded by the shield member 6 increases. Therefore, the amount of light transmitted through the device T decreases. When the amount of light incident on the automatic light control device 1 further increases, the support member 4 further expands and the condensing region 7 and the shielding member 6 come closer to each other. As a result, as shown in FIG. The optical path cross section of L is smaller than that of the shielding member 6. Therefore, as shown in FIG. 5, almost all the lens transmitted light L
Are shielded by the shielding member 6, and as a result, the light amount of the device transmitted light T becomes almost zero.

On the other hand, when the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 3, the temperature of the automatic light control device 1 is lowered. When the temperature of the automatic light control device 1 is lowered, the support member 4 is contracted thereby, and as a result, the lens plate 3 is moved toward the shielding member 6 as shown in FIG. When the lens plate 3 is moved in the direction of approaching the shielding member 6, the condensing region 7 moves away from the shielding member 6, so that the shielding member 6 occupies the optical path cross section S of the lens transmitted light L as shown in FIG. The rate decreases. As a result, the ratio of the lens transmitted light L shielded by the shielding member 6 is reduced, so that the light amount of the device transmitted light T is increased. When the amount of light incident on the automatic light control device 1 is small, the support member 4 is largely contracted and the condensing region 7 is moved away from the shielding member 6. Therefore, when the amount of light incident on the automatic light control device 1 is small, the lens is The proportion of the shield member 6 in the optical path cross section of the transmitted light L is reduced, and as a result, the proportion of the lens transmitted light L shielded by the shield member 6 is reduced. Therefore, the light amount of the device transmitted light T increases.

By the way, as in the case shown in FIG. 3 or FIG.
If it is blocked by the
Of the lens transmitted light L is composed of the lens transmitted light L traveling on both sides of the shielding member 6. Therefore, as shown in FIG. 9, a pair of device transmitted lights Ta1 and Ta2 are formed by the lens transmitted light that passes through the cylindrical lens 5a and proceeds without being blocked by the corresponding shield member 6a. The pair of device transmitted lights Ta1 and Ta2 travel toward the corresponding condensing region 7a, and after passing through the condensing region 7a, these device transmitted lights Ta1 and Ta2.
Progresses while spreading. On the other hand, the lens transmitted light L transmitted through the cylindrical lens 5a does not enter the region D between the region where the device transmitted light Ta1 travels and the region where the device transmitted light Ta2 travels. Therefore, when the automatic light control device 1 is provided with only one cylindrical lens 5a, a region that is bright due to the incidence of the device transmitted light Ta and a region that is dark due to the absence of the device transmitted light Ta. Regions, that is, the light amount distribution of the device transmitted light T becomes non-uniform. However, in the embodiment shown in FIG. 1, the automatic light control device 1 is provided with a plurality of cylindrical lenses 5, and the device transmitted lights Tb and Tc that have passed through the cylindrical lenses 5b and 5c adjacent to the cylindrical lens 5a also correspond to the collected light. Light area 7b,
After passing through 7c, the light propagates while spreading, so that the device transmitted lights Tb and Tc are incident on the region D where the device transmitted lights Ta1 and Ta2 are not incident, as shown in FIG. Further, in this area D, the lenses 5 adjacent to the cylindrical lenses 5b and 5c are provided.
Light transmitted through the device that has passed through can also be incident. As a result, the region D where the device transmitted lights Ta1 and Ta2 are not incident is prevented from becoming dark, so that the light amount distribution of the device transmitted light T can be made substantially uniform.

In the embodiment shown in FIG. 1, the shielding member 6
Need only have a light-shielding action, that is, it is not necessary to have a dimming action. Therefore, the automatic light control device 1 is inferior in heat resistance or light resistance, for example, a substantially uniform device transmission without providing a liquid crystal element. The amount of light can be obtained. As a result, it is possible to secure a stable light control action of the automatic light control device 1 for a long period of time. Further, in the embodiment shown in FIG. 1, the shielding member 6 is arranged in the optical path of the lens transmitted light L between the cylindrical lens 5 and the condensing region 7, and therefore, from the optical path cross section of the light when entering the cylindrical lens 5. In addition, a part or all of the lens-transmitted light L having a narrow optical path cross section is blocked by the blocking member 6. Therefore, even if the movement amount of the cylindrical lens 5 is extremely small, the change of the ratio of the shielding member 6 occupying in the optical path cross section of the lens transmitted light L can be increased. Therefore, even if the movement amount of the cylindrical lens 5 is extremely small, the device It is possible to increase the light amount change of the transmitted light T. Further, since the movement amount of the cylindrical lens 5 may be small, the light amount of the device transmitted light T can be quickly controlled.

In the embodiment shown in FIG. 1, when the temperature of the support member 4 is a high temperature of, for example, 60 ° C., the automatic light control device 1 has a light control action as shown in FIGS.
In addition, when the temperature of the support member 4 is a low temperature of 0 ° C., for example, the dimensions and the coefficient of thermal expansion of the support member 4 are set in advance so that the automatic light control device 1 has a light control action as shown in FIGS. 7 and 8. To be selected.

FIG. 10 shows another embodiment according to the first invention. In this embodiment, components similar to those in FIG. 1 are designated by the same numbers. In the embodiment shown in FIG.
The lens plate 3 provided with a plurality of cylindrical lenses 5 is fixed to a frame (not shown), for example, while the transparent plate 2 is supported by the lens plate 3 via a moving device 8. In the present embodiment, the moving device 8 constituting the moving means moves the transparent plate 2 relative to the lens plate 3. The moving device 8 is composed of, for example, an electric piston, and is driven based on an output signal from the electronic control unit 9. See also FIG.
As shown in 0, the light quantity sensor 10 is attached to the light incident side of the automatic light control device 1. The light quantity sensor 10 generates an output voltage proportional to the light quantity of light incident on the automatic light control device 1, and the output voltage is input to the electronic control unit 9.
In the embodiment shown in FIG. 10, the moving device 8 is driven so that the transparent plate 2 approaches the lens plate 3 as the amount of light incident on the automatic light control device 1 detected by the light amount sensor 10 increases. .

FIG. 11 shows the case where parallel light is incident on the automatic light control device 1. When parallel light is incident on the automatic light control device 1, the lens-transmitted light L transmitted through the cylindrical lens 5
Are condensed by the respective cylindrical lenses 5, so that the lens-transmitted light L advances toward the corresponding condensing region 7 while its optical path cross section decreases. Also in the embodiment shown in FIG. 10, since the lens 5 is composed of a cylindrical lens, each converging area 7 is composed of a line segment area extending parallel to the extending direction of the cylindrical lens 5. The lens-transmitted light L that has passed through the condensing region 7 then advances while its optical path section increases, and then the lens-transmitted light L.
The optical path cross section of is larger than the optical path cross section of the light when entering the cylindrical lens 5.

In the embodiment shown in FIG. 10, each shielding member 6 is provided so as to be always positioned in the optical path of the lens transmitted light L after passing through the corresponding condensing area 7 as shown in FIG. There is. Further, each shielding member 6 is, as described later,
The corresponding optical path cross section of the lens transmitted light L is always located in the optical path of the lens transmitted light L which is narrower than the optical path cross section of the light incident on the cylindrical lens 5. That is,
Assuming that the optical path cross section of each lens-transmitted light L is the same as the optical path cross section of the light incident on the cylindrical lens 5 at the position P shown in FIG. 11, each shielding member 6 is located between the light converging region 7 corresponding to the position P. The lens is always positioned in the optical path of the lens transmitted light L.

When the amount of light incident on the automatic light control device 1 detected by the light amount sensor 10 is larger than that shown in FIG. 11, the moving device 8 is driven to move the transparent plate 2 toward the lens plate 3. To be done. When the transparent plate 2 approaches the lens plate 3, each shielding member 6 approaches the corresponding condensing region 7, so that the ratio of the shielding member 6 in the optical path cross section S of the lens transmitted light L increases. As a result, the ratio of the lens transmitted light L shielded by the shielding member 6 is increased, and thus the light amount of the device transmitted light T is reduced. The moving device 8 is driven so that the transparent plate 2 approaches the lens plate 3 when the amount of light entering the automatic light control device 1 is large, and thus the moving device 8 is driven by the lens when the amount of light entering the automatic light control device 1 is large. The proportion of the shield member 6 in the optical path cross section of the transmitted light L increases, and as a result, the proportion of the lens transmitted light L shielded by the shield member 6 increases. Therefore, the amount of light transmitted through the device T decreases. When the amount of light entering the automatic light control device 1 further increases, the moving device 8 moves the transparent plate 2 in a direction closer to the lens plate 3, and as a result, the optical path cross section of the lens transmitted light L is smaller than that of the shielding member 6. Become. Therefore, as shown in FIG. 12, almost all the lens transmitted light L is shielded by the shielding member 6, and the light amount of the device transmitted light T becomes substantially zero. In the embodiment shown in FIG. 10, the moving device 8 is driven so that the shielding member 6 does not come closer to the lens plate 3 than the position shown in FIG.

On the other hand, when the amount of light incident on the automatic light control device 1 detected by the light amount sensor 10 is smaller than that shown in FIG. 11, the moving device 8 is driven and transparent as shown in FIG. The plate 2 is moved in a direction away from the lens plate 3. When the transparent plate 2 moves away from the lens plate 3, each shielding member 6 moves away from the corresponding condensing region 7, and therefore the ratio of the shielding member 6 in the optical path cross section S of the lens transmitted light L decreases. As a result, the ratio of the lens transmitted light L shielded by the shielding member 6 is reduced, so that the light amount of the device transmitted light T is increased. The moving device 8 is driven in a direction in which the transparent plate 2 moves away from the lens plate 3 when the amount of light incident on the automatic light control device 1 is small, and thus when the amount of light entering the automatic light control device 1 is small, The proportion of the shield member 6 in the optical path cross section of the transmitted light L is reduced, and as a result, the proportion of the lens transmitted light L shielded by the shield member 6 is reduced. Therefore, the light amount of the device transmitted light T increases. In the embodiment shown in FIG. 10, the moving device 8 is driven so that the shielding member 6 does not move farther from the lens plate 3 than the position P shown in FIG.

Also in the embodiment shown in FIG. 10, FIG.
Alternatively, when a part of the lens transmitted light L is shielded by the shielding member 6 as in the case shown in FIG. 13, the device transmitted light T is the lens transmitted light L on both sides of the shielding member 6. Is formed of a pair of lens-transmitted light beams L that have traveled. Therefore, the region between the pair of device transmitted lights T may be dark. However, also in the embodiment shown in FIG. 10, the automatic light control device 1 is provided with the plurality of lenses 5, and the device transmitted light T transmitted through each cylindrical lens 5 is not blocked by the blocking member 6. Since the light propagates while expanding, the device transmitted light T transmitted through another cylindrical lens 5 enters a region where the device transmitted light T transmitted through a certain cylindrical lens 5 does not enter. As a result, the device transmitted light T
It is prevented that the region where is not incident becomes dark, so that the light amount distribution of the device transmitted light T can be made substantially uniform. Further, also in the embodiment shown in FIG. 10, the shielding member 6
Since it suffices that the light control function is provided, the stable light control function of the automatic light control device 1 can be secured for a long period of time.

By the way, when the shielding member 6 is further away from the lens plate 3 than the position P shown in FIG.
The ratio of the lens transmitted light L shielded by is further reduced. However, the shielding member 6 is located at the position P with respect to the lens plate 3.
When the shielding member 6 is located further away, that is, when the shielding member 6 is located in the optical path of the lens transmitted light L in which the optical path cross section of the lens transmitted light L is wider than the optical path cross section of the light incident on the cylindrical lens 5. In order to increase the light amount change of the transmitted light T, the movement amount of the shielding member 6 has to be increased. Therefore, in the embodiment shown in FIG. 10, the shielding member 6 is kept away from the lens plate 3 from the position P shown in FIG. 11, that is, the optical path cross section of the lens transmitted light L is incident on the cylindrical lens 5. The shielding member 6 is always positioned in the optical path of the lens transmitted light L which is narrower than the optical path cross section of the light so that a large light amount change of the device transmitted light T can be obtained with a small movement amount of the shielding member 6. ing. Moreover, since the movement amount of the cylindrical lens 5 may be small, the light amount of the device transmitted light T can be quickly controlled.

In the embodiment shown in FIG. 10, the light amount sensor 10 is provided on the light incident side of the automatic light control device 1 to provide the automatic light control device 1.
The moving device 8 is driven so that the amount of the lens-transmitted light L blocked by the blocking member 6 is reduced as the amount of light incident on is increased. However, the light amount sensor 10 is arranged on the light transmitting side of the automatic light control device 1 in order to detect the light amount of the device transmitted light T, and the moving device 8 is arranged so that the light amount of the device transmitted light T is constantly maintained, for example. It may be driven. Further, a temperature sensor is provided instead of the light amount sensor 10 to detect the temperature of the automatic light control device 1 or the device transmitted light T, for example, the temperature in the room, and when the temperature detected by this temperature sensor is high, for example. The moving device 8 may be driven so that the light amount of the device transmitted light T is reduced. The other operations of the automatic light control device 1 according to this embodiment are similar to those of the embodiment shown in FIG.

FIG. 14 shows still another embodiment according to the first invention. Also in this embodiment, the same components as those in FIG. 1 are indicated by the same numbers. Referring to FIG. 14, a peripheral wall portion 11 is integrally formed with the lens plate 3 at a peripheral portion of the lens plate 3 having a plurality of cylindrical lenses 5. The lens plate 3 is fixed to, for example, a frame, while the transparent plate 2 has an inner surface 11a of the peripheral wall portion 11 with a seal member 12 interposed therebetween.
Supported by. The transparent plate 2 is supported so as to be movable along the inner surface 11a of the peripheral wall portion 11. The sealed space 13 surrounded by the lens plate 3 and the transparent plate 2 is filled with a transparent and chemically stable gas such as air or a rare gas, and the gas in the sealed space 13 is used in this embodiment. It constitutes a means of transportation. The airtightness inside the closed space 13 is ensured by the seal member 12, and the seal member 12 ensures smooth movement of the transparent plate 2. Incidentally, in the embodiment shown in FIG. 14, each shielding member 6
Is the same as the embodiment shown in FIG.
And is always positioned in the optical path of the lens transmitted light L located between the lens plate 3 and the lens plate 3.

FIG. 14A shows the case where the amount of light entering the automatic light control device 1 is small. At this time, a part of the lens transmitted light L transmitted through each cylindrical lens 5 travels without being shielded by the corresponding shielding member 6 to form the device transmitted light T. When the amount of light incident on the automatic light control device 1 increases, the temperature of the automatic light control device 1 rises, whereby the temperature of the gas in the closed space 13 rises and the gas in the closed space 13 expands. . Closed space 1
When the gas inside 3 expands, the transparent plate 2 moves in a direction away from the cylindrical lens 5 in order to keep the pressure inside the closed space 13 constant, and as a result, the shielding member 6 comes closer to the light collecting region 7. Therefore, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L increases. As the amount of light that enters the automatic light control device 1 increases, the temperature of the gas in the closed space 13 rises and the gas in the closed space 13 expands, so the amount of light that enters the automatic light control device 1 increases. The closer the shielding member 6 is to the condensing region 7, the more the ratio of the shielding member 6 in the optical path cross section of the lens transmitted light L increases. As a result, as the amount of light incident on the automatic light control device 1 increases, the ratio of the lens transmitted light L shielded by the shielding member 6 increases, and the amount of the device transmitted light T decreases.

When the amount of light incident on the automatic light control device 1 further increases, the temperature of the gas in the closed space 13 rises and the gas in the closed space 13 further expands, so that the transparent plate 2 is further extended from the cylindrical lens 5. As a result, the optical path cross section of the lens-transmitted light L becomes smaller than that of the shielding member 6, as shown in FIG. Therefore, at this time, almost all the lens transmitted light L is shielded by the shielding member 6, and the light amount of the device transmitted light T becomes substantially zero.

When the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 14 (B), the temperature of the automatic light control device 1 is lowered, whereby the temperature of the gas in the closed space 13 is decreased. And the gas in the closed space 13 contracts. Therefore, in order to keep the pressure in the closed space 13 constant, the transparent plate 2 moves toward the cylindrical lens 5, and as a result, the shielding member 6 moves away from the light collecting region 7. Therefore, the ratio of the shielding member 6 in the optical path cross section of the lens transmitted light L is reduced, and the ratio of the lens transmitted light L shielded by the shielding member 6 is reduced.
The amount of light is increased. As the amount of light that enters the automatic light control device 1 decreases, the temperature of the gas in the closed space 13 decreases and the gas in the closed space 13 contracts, so the amount of light that enters the automatic light control device 1 decreases. As a result, the shielding member 6 becomes farther from the condensing region 7, so that the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L decreases. As a result, as the amount of light incident on the automatic light control device 1 decreases, the ratio of the lens transmitted light L shielded by the shielding member 6 decreases, and the amount of the device transmitted light T increases.

In the embodiment shown in FIG. 14 as well, as in the embodiment shown in FIG. 1, the device transmitted light T propagates while spreading after passing through the condensing region 7, so that a certain lens 5 The device transmitted light T transmitted through another lens 5 is incident on a region where the device transmitted light T transmitted through is not incident, so that a uniform light amount distribution of the device transmitted light T can be obtained. Further, also in the embodiment shown in FIG. 14, since the shielding member 6 only needs to have a light shielding effect, it is possible to secure a stable light adjusting effect of the automatic light control device 1 for a long period of time. Further, the shielding member 6 is arranged in the optical path cross section of the lens transmitted light L which is narrower than the optical path cross section of the light incident on the cylindrical lens 5, and shields a part or all of this lens transmitted light L. Even if the movement amount of the member 6 is small, it is possible to obtain a large light amount change of the device transmitted light T.

In the embodiment shown in FIG. 14, the automatic light control device 1 is used when the temperature of the gas in the closed space 13 is low.
Has a dimming action as shown in FIG. 14 (A), and when the temperature of the gas in the closed space 13 is high, the automatic light control device 1 has a dimming action as shown in FIG. 14 (B). As provided, the volume of the enclosed space 13 or the expansion coefficient of the gas filling the enclosed space 13 is preselected. The closed space 13 may be filled with a transparent and chemically stable liquid instead of the gas. In this case, the closed space 13
The boiling point and the freezing point of the liquid filling the inside of the automatic dimmer 1
The liquid is preselected so that is outside the temperature range normally used. Further, in this case, it is necessary to consider that the optical path of the lens transmitted light L can be changed by the liquid in the closed space 13. Since the other operations of the embodiment shown in FIG. 14 are the same as those of the embodiment shown in FIG. 1, description thereof will be omitted.

15 to 17 show still another embodiment according to the first invention. Also in this embodiment, FIG.
The same components as those are indicated by the same numbers. Referring to FIGS. 15 to 17, a transparent plate 14 extending parallel to the lens plate 3 is provided on the light transmitting side of the lens plate 3 so as to be spaced apart from the lens plate 3, and the transparent plate 14 together with the side wall 15 is provided. It is formed integrally with the lens plate 3. A transparent movable body 16 is arranged between the lens plate 3 having a plurality of cylindrical lenses 5 and the transparent plate 14, and the transparent movable body 16 is provided with a transparent seal member 17 between the inner surface of the lens plate 3 and the transparent plate. And the inner surface of 14. In addition, the transparent movable body 1
6 is movably supported along the inner surface of the lens plate 3 and the inner surface of the transparent plate 14. Further, the shielding member 6 is formed inside the transparent movable body 16. As shown in FIGS. 15 to 17, the inside of the closed space 18 surrounded by the inner surfaces of the lens plate 3, the side wall 15, and the transparent plate 14 and the outer surface of the movable body 16 is transparent and chemically stable. A gas is filled, and this gas constitutes the moving means in this embodiment. Instead of this gas, the sealed space 18 may be filled with a transparent and chemically stable liquid. Closed space 18
The inner airtightness is ensured by the seal member 17, and the seal member 17 ensures smooth movement of the movable body 16. In addition, in this embodiment, each shielding member 6 is provided so as to be always located between the corresponding cylindrical lens 5 and the condensing region 7.

FIG. 15 shows when the amount of light incident on the automatic light control device 1 is small. At this time, each shielding member 6 is located outside the optical path of the corresponding lens transmitted light L. Therefore, all the lens transmitted light L travels without being shielded by the shielding member 6, and as a result, all the lens transmitted light L constitutes the device transmitted light T.

The amount of light incident on the automatic light control device 1 is shown in FIG.
When the temperature is higher than the case shown in FIG. 5, the temperature of the automatic light control device 1 rises, whereby the temperature of the gas in the closed space 18 rises and the gas in the closed space 18 expands. Closed space 1
When the gas in 8 expands, the transparent movable body 16 moves to the left side in the drawing in order to keep the pressure in the closed space 18 constant. When the transparent movable body 16 moves to the left side in the drawing, a part of each shielding member 6 comes to be positioned in the optical path of the corresponding lens transmitted light L, and therefore, as shown in FIG. It is shielded by the shield member 6. As a result, the light amount of the device transmitted light T is reduced. As the amount of light entering the automatic light control device 1 increases, the temperature of the gas in the closed space 18 rises and the gas in the closed space 18 expands, so the amount of light entering the automatic light control device 1 increases. As a result, the transparent movable body 16 moves to the left side in the drawing, so that the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L increases. As a result, as the amount of light incident on the automatic light control device 1 increases, the ratio of the lens transmitted light L shielded by the shielding member 6 increases, and the amount of the device transmitted light T decreases.

When the amount of light incident on the automatic light control device 1 further increases, the transparent movable body 16 moves further to the left in the drawing, and as a result, almost all the lens transmitted light L is shielded by the shielding member 6 as shown in FIG. Will be shielded by.
Therefore, the light amount of the device transmitted light T becomes substantially zero.

The amount of light incident on the automatic light control device 1 is shown in FIG.
When it is smaller than that shown in FIG. 7, the temperature of the automatic light control device 1 is lowered, whereby the temperature of the gas in the closed space 18 is lowered and the gas in the closed space 18 is contracted. Therefore, in order to keep the pressure in the closed space 18 constant, the transparent movable body 16
Moves to the right in the drawing. When the transparent movable body 16 moves to the right side in the drawing, as shown in FIG. 16, a part of the lens transmitted light L proceeds without being shielded by the shielding member 6, so that a part of the lens transmitted light L is transmitted. The device transmitted light T is constituted. Automatic light control device 1
The temperature of the gas in the closed space 18 decreases and the gas in the closed space 18 contracts as the amount of light incident on the transparent movable body decreases as the amount of light entering the automatic light control device 1 decreases. 16 moves to the right side in the drawing, and therefore the ratio of the shielding member 6 in the optical path cross section of the lens transmitted light L decreases. As a result, as the amount of light incident on the automatic light control device 1 decreases, the ratio of the lens transmitted light L shielded by the shielding member 6 decreases, and the amount of the device transmitted light T increases.

When the amount of light incident on the automatic light control device 1 further decreases, the transparent movable body 16 moves further to the right in the drawing, and as a result, the shielding member 6 is outside the optical path of the lens transmitted light L as shown in FIG. Will be located in. Therefore, almost all the lens transmitted light L travels without being shielded by the shielding member 6 to form the device transmitted light T.

In this embodiment as well, as in the embodiment shown in FIG. 1, the device transmitted light T propagates while spreading after passing through the condensing area 7, so that the device transmitted through a certain lens 5 is used. The device transmitted light T transmitted through another lens 5 enters the region where the transmitted light T does not enter, so that a uniform light amount distribution of the device transmitted light T can be obtained. Further, since the shielding member 6 only needs to have a light shielding effect, it is possible to secure a stable light adjusting action of the automatic light control device 1 for a long period of time. Further, in this embodiment, the transmitted light T
It is possible to adjust the light amount of the light from about 0% (see FIG. 17) to about 100% (see FIG. 15) of the light transmitted through the lens L. The other operations of the embodiment shown in FIGS. 15 to 17 are the same as those of the embodiment shown in FIG.

FIG. 18 shows still another embodiment according to the first invention. In the embodiment shown in FIG. 18, the shield member 6 provided on the transparent plate 2 is composed of a pair of shield members, and the pair of shield members 6 are always positioned between the cylindrical lens 5 and the corresponding condensing area 7. It is provided to do. Further, the pair of shielding members 6 are arranged on each side of the light collecting region 7 so as to be separated from each other. Further, the shielding member 6
Is also made of a heat-expandable material and also constitutes the moving means.
On the other hand, in the embodiment shown in FIG. 18, the transparent plate 2 and the lens plate 3 are fixed to each other by the fixing member 4 ', so that the gap distance between the transparent plate 2 and the lens plate 3 is always kept constant. .

19 (A), (B) and (C) show partially enlarged views of one cylindrical lens 5 and the corresponding shielding member 6, and FIG. 19 (A) shows the automatic light control device 1.
It is shown when the amount of light incident on is small. When the amount of light entering the automatic light control device 1 is small, the temperature of the automatic light control device 1 is low, so the temperature of the shielding member 6 is also low, and therefore the shielding member 6 is contracted. Therefore, the shielding member 6
Is located outside the optical path of the lens transmitted light L as shown in FIG.
Constitutes a device transmitted light T which travels without being shielded by the shielding member 6 and propagates while spreading. When the amount of light incident on the automatic light control device 1 increases, the temperature of the automatic light control device 1 rises, which causes the temperature of the shield member 6 to rise and the thermally expandable shield member 6 to have a narrow gap therebetween. So that it extends along the transparent plate 2. When the shielding member 6 is extended and the gap between the pair of shielding members 6 is reduced, as shown in FIG.
As shown in (B), a part of the shielding member 6 causes the lens transmitted light L
Of the lens transmitted light L, and a part of the lens-transmitted light L is shielded by the shielding member 6. Therefore, the amount of light transmitted through the device T decreases. As the amount of light incident on the automatic light control device 1 increases, the temperature of the shield member 6 rises and the shield member 6 expands greatly, so that the gap between the shield members 6 becomes small, and as a result, the lens transmitted light L Since the proportion of the shielding member 6 in the cross section of the optical path increases, the light amount of the device transmitted light T decreases as the light amount of the light incident on the automatic light control device 1 increases.

When the amount of light incident on the automatic light control device 1 further increases, the temperature of the shield member 6 further rises, and the shield member 6 further extends along the transparent plate 2 as a result.
As shown in FIG. 9C, the pair of shielding members 6 come into contact with each other. At this time, all the lens transmitted light L is shielded by the shielding member 6, so that the light amount of the device transmitted light T becomes substantially zero.

When the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 19C, the temperature of the automatic light control device 1 is lowered. When the temperature of the automatic light control device 1 decreases, the temperature of the shielding member 6 decreases and the shielding member 6 contracts along the transparent plate 2, and as a result, the ratio of the shielding member 6 in the optical path cross section of the lens transmitted light L is reduced. Decrease. Therefore, as shown in FIG. 19B, a part of the lens-transmitted light L advances without being shielded by the shield member 6 to form the device-transmitted light T. As the amount of light incident on the automatic light control device 1 decreases, the temperature of the shielding member 6 greatly decreases and the shielding member 6 contracts greatly, and as a result, the lens transmitted light L
Since the proportion of the shielding member 6 in the optical path cross section decreases, the light amount of the light transmitted through the device increases as the light amount of the light incident on the automatic light control device 1 decreases. Furthermore, automatic light control device 1
When the light amount of the light incident on is reduced, the shield member 6 further contracts, and as a result, the shield member 6 is positioned outside the optical path of the lens transmitted light L as shown in FIG. At this time, all the lens transmitted light L constitutes the device transmitted light T which propagates while spreading.

Also in this embodiment, since the device transmitted light T propagates while spreading after passing through the condensing region 7, another region is not incident on the device transmitted light T transmitted through a certain lens 5. The device transmitted light T that has passed through the lens 5 enters, so that a uniform light amount distribution of the device transmitted light T can be obtained.

FIG. 20 shows still another embodiment according to the first invention. In the embodiment shown in FIG. 20 as well, the shielding member 6 is always located between the cylindrical lens 5 and the corresponding condensing region 7, and includes a pair of shielding members provided on both sides of the condensing region 7. Composed. Further, the shielding member 6 is made of a heat-expandable material and also constitutes a moving means. However, in the embodiment shown in FIG. 20, the shielding member 6 is provided so as to extend from the transparent plate 2 toward the cylindrical lens 5. Also in this embodiment, the transparent plate 2 and the lens plate 3 are fixed to each other by the fixing member 4 ', so that the gap distance between the transparent plate 2 and the lens plate 3 is always kept constant.

21 (A) and 21 (B) are partial enlarged views of one cylindrical lens 5 and the corresponding shielding member 6, and FIG. 21 (A) shows the light incident on the automatic light control device 1. It shows when the amount of light is low. Automatic light control device 1
When the amount of light incident on is small, since the temperature of the automatic light control device 1 is low, the temperature of the shielding member 6 is also low, and therefore the shielding member 6 is contracted. Therefore, the pair of shielding members 6
Is located outside the optical path of the lens transmitted light L as shown in FIG. 21 (A), and therefore all the lens transmitted light L advances and spreads without being shielded by the shielding member 6. It constitutes the transmitted light T. When the amount of light incident on the automatic light control device 1 increases, the temperature of the automatic light control device 1 rises, which causes the temperature of the shield member 6 to rise and the heat-expandable shield member 6 to face the cylindrical lens 5. Extend. When the shielding member 6 extends toward the cylindrical lens 5, a part of the shielding member 6 comes to be located in the optical path of the lens transmitted light L as shown in FIG. A part will be shielded by the shielding member 6. Therefore, the amount of light transmitted through the device T decreases. As the amount of light incident on the automatic light control device 1 increases, the temperature of the shielding member 6 rises and the shielding member 6 greatly expands. As a result, the shielding member 6 occupies in the optical path cross section of the lens transmitted light L. As the ratio increases, automatic dimmer 1
The amount of light transmitted through the device T decreases as the amount of light incident on the device increases.

When the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 21 (B), the temperature of the automatic light control device 1 is lowered. When the temperature of the automatic light control device 1 decreases, the temperature of the shielding member 6 decreases and the shielding member 6 contracts, and as a result, the shielding member 6 occupies the optical path cross section of the lens transmitted light L.
The ratio of will decrease. Therefore, the light amount of the device transmitted light T increases. As the amount of light incident on the automatic light control device 1 decreases, the temperature of the shielding member 6 greatly decreases and the shielding member 6
Significantly contracts, and as a result, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L decreases, so that the device transmitted light T decreases as the amount of light incident on the automatic light control device 1 decreases.
The amount of light is increased. When the amount of light incident on the automatic light control device 1 further decreases, the shielding member 6 further contracts, and as a result, the shielding member 6 is positioned outside the optical path of the lens transmitted light L as shown in FIG. Become. At this time, all the lens transmitted light L constitutes the device transmitted light T.

Also in this embodiment, since the device transmitted light T propagates while spreading after passing through the condensing region 7, another region is not incident on the device transmitted light T transmitted through a certain lens 5. The device transmitted light T that has passed through the lens 5 enters, so that a uniform light amount distribution of the device transmitted light T can be obtained.

FIG. 22 shows still another embodiment according to the first invention. In the embodiment shown in FIG. 22,
The shielding member 6 is mounted on the inner side surface of the cylindrical lens 5, so that it is not necessary to provide the transparent plate as in the embodiment of FIG. The shielding member 6 is also made of a heat-expandable material and also constitutes a moving means.

23 (A) and 23 (B) are partial enlarged views of one cylindrical lens 5 and the corresponding shielding member 6, and FIG. 23 (A) shows light incident on the automatic light control device 1. It shows when the amount of light is low. Automatic light control device 1
When the amount of light incident on is small, since the temperature of the automatic light control device 1 is low, the temperature of the shielding member 6 is also low, and therefore the shielding member 6 is contracted. Therefore, most of the lens-transmitted light L constitutes the device-transmitted light T that travels while being propagated and spread without being shielded by the shielding member 6. When the amount of light incident on the automatic light control device 1 increases, the automatic light control device 1
Temperature of the shielding member 6 rises, and the temperature of the shielding member 6 rises so that the thermally expandable shielding member 6 extends toward the light collecting region 7. When the shielding member 6 extends toward the condensing region 7, the ratio of the shielding member 6 in the optical path cross section of the lens transmitted light L increases, and as a result, the light amount of the device transmitted light T decreases. As the amount of light incident on the automatic light control device 1 increases, the temperature of the shielding member 6 rises and the shielding member 6 greatly expands. As a result, the shielding member 6 occupies in the optical path cross section of the lens transmitted light L. Since the ratio increases, the light amount of the light transmitted through the device T decreases as the light amount of the light entering the automatic light control device 1 increases.

When the amount of light incident on the automatic light control device 1 further increases, the temperature of the automatic light control device 1 further rises, whereby the temperature of the shield member 6 further rises, and the thermally expandable shield member 6 is removed. It further extends toward the light collecting region 7. As a result, the optical path cross section of the lens transmitted light L becomes smaller than that of the shielding member 6 as shown in FIG. Therefore, all the lens transmitted light L is blocked by the blocking member 6, and the light amount of the device transmitted light T becomes substantially zero.

When the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 23 (B), the temperature of the automatic light control device 1 is lowered. When the temperature of the automatic light control device 1 decreases, the temperature of the shielding member 6 decreases and the shielding member 6 contracts toward the cylindrical lens 5, and as a result, as shown in FIG. Will travel without being shielded by the shielding member 6 to form the device transmitted light T. As the amount of light incident on the automatic light control device 1 decreases, the temperature of the shielding member 6 greatly decreases and the shielding member 6
Significantly contracts, and as a result, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L decreases, so that the device transmitted light T decreases as the amount of light incident on the automatic light control device 1 decreases.
The amount of light is increased.

Also in this embodiment, since the device transmitted light T propagates while spreading after passing through the condensing region 7, another region is not irradiated with the device transmitted light T transmitted through a certain lens 5. The device transmitted light T that has passed through the lens 5 enters, so that a uniform light amount distribution of the device transmitted light T can be obtained.

FIG. 24 shows an embodiment according to the second invention. Also in this embodiment, the same components as those in the embodiment shown in FIG. 1 are designated by the same reference numerals. Referring to FIGS. 24A and 24B, the cylindrical lens 5 has a transparent substrate 5a and both ends thereof fixed to the transparent substrate 5a.
And a transparent elastic film 5b. The sealed space 20 between the transparent substrate 5a and the elastic film 5b is filled with a transparent and chemically stable liquid. This closed space 2
The liquid in 0 constitutes the optical path changing means. The closed space 20 may be filled with a transparent and chemically stable gas. On the other hand, the transparent plate 2 and the transparent substrate 5a are fixed to each other by the fixing member 4 ', so that the gap distance between the transparent plate 2 and the transparent substrate 5a is always kept constant.

FIG. 25A shows the case where the amount of light incident on the automatic light control device 1 is small. When the amount of light entering the automatic light control device 1 is small, the temperature of the automatic light control device 1 is low, so the temperature of the liquid in the closed space 20 is low, and therefore the liquid in the closed space 20 is contracted. At this time, the optical path of the lens transmitted light L is such that the shielding member 6 is located between the cylindrical lens 5 and the condensing area 7.
Therefore, most of the lens-transmitted light L constitutes the device-transmitted light T that travels while being propagated and spread without being shielded by the shielding member 6. When the amount of light incident on the automatic light control device 1 increases, the temperature of the automatic light control device 1 rises, whereby the temperature of the liquid in the closed space 20 rises and the closed space 2
The liquid in 0 expands. When the liquid in the closed space 20 expands, the refractive index of the cylindrical lens 5 changes, and the optical path of the lens transmitted light L is changed so that the condensing area 7 approaches the shield member 6, that is, the focal length f is shortened. Be changed. As a result, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L increases, and therefore the light amount of the device transmitted light T decreases. As the amount of light entering the automatic light control device 1 increases, the temperature of the liquid in the closed space 20 rises and the liquid in the closed space 20 expands significantly, so that the focal length f becomes shorter. Lens transmitted light L
The optical path of is changed. Therefore, as the amount of light entering the automatic light control device 1 increases, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L increases, and as a result, the amount of device transmitted light T decreases.

When the amount of light incident on the automatic light control device 1 further increases, the temperature of the automatic light control device 1 further rises, whereby the temperature of the liquid in the closed space 20 further rises and the temperature inside the closed space 20 increases. The liquid expands further. For this reason,
The focal length f is further shortened so that the focal length f becomes equal to the gap distance between the transparent plate 2 and the transparent substrate 5a as shown in FIG. As a result, all the lens transmitted light L is shielded by the shielding member 6, so that the light amount of the device transmitted light T becomes substantially zero.

When the amount of light incident on the automatic light control device 1 is smaller than that shown in FIG. 25 (B), the temperature of the automatic light control device 1 is lowered. When the temperature of the automatic light control device 1 decreases, the temperature of the liquid in the closed space 20 decreases and the liquid in the closed space 20 contracts. When the liquid in the closed space 20 contracts, the optical path of the lens transmitted light L is changed so that the focal length f becomes longer. As a result, as shown in FIG. 25 (A), a part of the lens-transmitted light L advances without being shielded by the shield member 6 to form the device-transmitted light T. As the amount of light incident on the automatic light control device 1 decreases, the temperature of the liquid in the closed space 20 lowers and the liquid in the closed space 20 contracts, resulting in a longer focal length f. The optical path of the transmitted light L is changed. Therefore, as the amount of light incident on the automatic light control device 1 increases, the proportion of the shielding member 6 in the optical path cross section of the lens transmitted light L decreases, and as a result, the amount of device transmitted light T increases.

Also in this embodiment, since the device transmitted light T propagates while spreading after passing through the condensing region 7, another region is not provided with the device transmitted light T transmitted through a certain lens 5. The device transmitted light T that has passed through the lens 5 enters, so that a uniform light amount distribution of the device transmitted light T can be obtained. Further, since the shielding member 6 only needs to have a light shielding function, the automatic light control device 1 can be used for a long period of time.
It is possible to secure a stable dimming effect of the. further,
Also in this embodiment, the shielding member 6 is arranged in the optical path of the lens transmitted light L between the cylindrical lens 5 and the condensing area 7 as in the embodiment shown in FIG. Even if the change amount is extremely small, the change in the light amount of the device transmitted light T can be increased.

In the embodiment shown in FIG. 21, the closed space 20
The liquid inside expands or contracts according to the temperature of the automatic light control device 1 to change the optical path of the lens transmitted light L. However, by providing a liquid control device for supplying the liquid into the closed space 20 and discharging the liquid from the closed space 20, and controlling the volume of the closed space 20 by this liquid control device, the focal point of the lens transmitted light L is focused. The distance f, that is, the optical path of the lens transmitted light L may be changed. In this case, the liquid control device controls the volume of the liquid in the closed space 20 according to the output from the light amount sensor for detecting the light amount of the light incident on the automatic light control device 1, for example. Alternatively, each lens 5 is composed of a plurality of lenses that are spaced apart from each other in the traveling direction of the light incident on the lens 5, and lens moving means is provided, and the gap distance between these lenses is changed by this lens moving means. By doing so, the focal length f of the lens transmitted light, that is, the optical path of the lens transmitted light L may be changed.

[0055]

According to the first aspect of the present invention, it is possible to secure a stable light control action of the automatic light control device for a long period of time while making the light amount distribution of the lens transmitted light that proceeds without being blocked by the blocking member uniform. . According to the second aspect of the present invention as well, it is possible to secure a stable light control action of the automatic light control device for a long period of time while uniformizing the light amount distribution of the lens transmitted light that proceeds without being blocked by the blocking member.

[Brief description of drawings]

FIG. 1 is a side view of an automatic light control device according to an embodiment of the first invention.

FIG. 2 is a sectional view of the automatic light control device taken along line II-II in FIG.

FIG. 3 shows when the temperature of the automatic light control device is medium temperature,
It is a side view of the automatic light control device of FIG.

4 is a partially enlarged cross-sectional view of the automatic light control device taken along line IV-IV in FIG.

FIG. 5 shows when the temperature of the automatic light control device is high,
It is a side view of the automatic light control device of FIG.

FIG. 6 is a partially enlarged cross-sectional view of the automatic light control device taken along line VI-VI in FIG.

FIG. 7 shows when the temperature of the automatic light control device is low,
It is a side view of the automatic light control device of FIG.

8 is a partially enlarged cross-sectional view of the automatic light control device taken along line VIII-VIII in FIG. 7.

FIG. 9 is a diagram illustrating a traveling direction of light transmitted through the device that has passed through different lenses.

FIG. 10 is a side view of an automatic light control device according to another embodiment of the first invention.

11 is a side view of the automatic light control device of FIG. 10, showing when the temperature of the automatic light control device is medium.

12 is a side view of the automatic light control device of FIG. 10, showing when the temperature of the automatic light control device is high.

FIG. 13 is a side view of the automatic light control device of FIG. 10, showing when the temperature of the automatic light control device is low.

FIG. 14 is a side view of an automatic light control device according to another embodiment of the first invention, (A) shows a temperature of the automatic light control device when it is low, and (B) shows a temperature of the automatic light control device. Shows when the temperature is high.

FIG. 15 is a side view of an automatic light control device according to still another embodiment of the first invention, showing a case where the temperature of the automatic light control device is low.

FIG. 16 is a side view of the automatic light control device similar to FIG. 15, showing a case where the temperature of the automatic light control device is an intermediate temperature.

FIG. 17 is a side view of an automatic light control device similar to that of FIG. 15, showing a case where the temperature of the automatic light control device is high.

FIG. 18 is a side view of an automatic light control device according to another embodiment of the first invention.

19 is a partially enlarged side view of the automatic light control device according to the embodiment shown in FIG. 18, (A) showing the temperature of the automatic light control device when it is low, and (B) showing the temperature of the automatic light control device. Is medium temperature, (C) shows the temperature of the automatic light control device is high.

FIG. 20 is a side view of an automatic light control device according to another embodiment of the first invention.

21 is a partially enlarged side view of the automatic light control device according to the embodiment shown in FIG. 20, (A) when the temperature of the automatic light control device is low, and (B) is the temperature of the automatic light control device. Shows when the temperature is high.

FIG. 22 is a side view of an automatic light control device according to another embodiment of the first invention.

23 is a partially enlarged side view of the automatic light control device according to the embodiment shown in FIG. 22, where (A) is the temperature of the automatic light control device when it is low, and (B) is the temperature of the automatic light control device. Shows when the temperature is high.

FIG. 24 is a side view of an automatic light control device according to an embodiment of the second invention.

FIG. 25 is a partially enlarged side view of the automatic light control device according to the second embodiment of the present invention, where (A) is the temperature of the automatic light control device when it is low, and (B) is the temperature of the automatic light control device. Shows when the temperature is high.

[Explanation of Codes] 1 ... Automatic light control device 2 ... Transparent plate 3 ... Lens plate 4 ... Support member 5 ... Cylindrical lens 6 ... Shielding member 7 ... Focusing area 8 ... Moving device L ... Lens transmitted light T ... Device transmitted light

Claims (2)

[Claims] 1. A plurality of lenses for condensing light are provided, these lenses are arranged in parallel with each other, and light transmitted through each lens having an optical path cross section narrower than an optical path cross section of light incident on each lens is shielded. A lens having a shield member capable of increasing the proportion of the shield member in the optical path cross section of the lens transmitted light when the light amount of the lens transmitted light traveling without being shielded by the shield member should be reduced. Alternatively, the automatic light control device further includes moving means for moving the shielding member. 2. A plurality of lenses for condensing light are provided, the lenses are arranged in parallel with each other, and light transmitted through each lens having an optical path cross section narrower than an optical path cross section of light incident on each lens is shielded. A lens having a shield member capable of increasing the proportion of the shield member in the optical path cross section of the lens transmitted light when the light amount of the lens transmitted light traveling without being shielded by the shield member should be reduced. An automatic light control device further comprising optical path changing means for changing the optical path of transmitted light.