CN2260238Y - Automatic brightness-adjusting table lamp - Google Patents

Abstract

The utility model discloses an automatic brightness regulating table lamp. A brightness regulating transfer switch, an amplifying circuit, a silicon controlling rectifier triggering circuit and a photosensitive device are arranged on a general table lamp, wherein, the reflecting light on the surface of the paper of the reading material and the intensity of the background light of the luminous environment can be measured by the photosensitive probe head in the photosensitive device, the exposure intensity of the light source can be automatically regulated by a control circuit, and the light intensity of the reflection light irradiating background in an appropriate range can be ensured. The utility model has the function thatthe visual fatigue generated by the long time reading, writing and working has little possibilities, and the utility model also has the function of manual light regulation.

Description

Desk lamp with an automatic light meter

The utility model belongs to the improvement of health tunable optical Table lamp structure.

As everyone knows, the illuminating ray when reading writing, too bright or that eyes are produced is tired, cause that easily eyesight descends.Now lamp dimmer all is that irradiation brightness is adjusted in the moving light modulation of armrest on the market, makes it the brightness that reaches certain, and this relies on the judgement of people to the demand light intensity fully, and peaceful bright not dark.Because the reflection difference of illumination under different paper or background condition, and the difference of the actual perceived brightness of human eye, this desk lamp all can't be realized automatic corresponding adjustment, so that irradiation brightness is suitable.For example, when under the desk lamp of same brightness, reading a book, if the paper of book is very pure white, its reverberation is just strong, opposite if paper is more outmoded, during the jaundice obfuscation, a little less than its reverberation, though eyes are just comparatively painstaking during reading. these phenomenon human eyes can be adjusted adaptation very soon, but the time has been grown the fatigue that then causes eyes easily, all is because brightness is not suitable for.

The purpose of this utility model provides a kind of desk lamp with an automatic light meter that can measure background reflectance light automatically, and what make that people experience when reading work is comfortable and soft light.

The technical solution of the utility model is, on the desk lamp that has base, lamp bracket, lampshade, light source and power switch to constitute, also be provided with light modulation change-over switch, amplifying circuit, thyristor gating circuit and light-sensitive unit, it is characterized in that amplifying circuit and thyristor gating circuit are installed in the base, power switch and light modulation transfer switch unit on the face of base, the manual light-control knob of light modulation change-over switch double as wherein; Light-sensitive unit is made of photosensitive probe and probe holder, have horn mouth on the probe holder, photosensitive probe is fixed in bell-mouthed end, probe holder fixture is near light source, its horn mouth is towards consistent with the light direction of illumination, and guarantee source light can not direct irradiation in horn mouth.The probe holder can be arranged on the limit portion of lamp bracket top or lampshade.

From above-mentioned feature as can be seen, because the utility model adopts photosensitive probe can measure the reverberation of reading matter paper surface and the background light intensity of irradiation environment, measuring-signal is delivered in the control circuit, finish the function of automatic adjusting light source exposure intensity, thereby make the intensity of light source irradiation reach proper value, guarantee to shine the catoptrical light intensity of background in suitable scope, reducing human eye greatly reads a book for a long time, write, the visual fatigue phenomenon that work is not suitable for causing because of light, also have automatic and manual light modulation change-over switch simultaneously, finish manual dimming function.

Accompanying drawing 1 is the structural representation of the designed specific embodiment of desk lamp with an automatic light meter of the utility model.Accompanying drawing 2 is the structural representation of light-sensitive unit in the utility model.1 is Desk lamp feet among the figure, and 2 is power switch, and 3 is automatic/hand light modulation change-over switch, the manual light-control knob of double as, and 4 is that lamp bracket, 5 is that lampshade, 6 is that light source, 7 is the probe holder, and 8 is photosensitive probe.

Describe specific embodiments of the present utility model in detail below in conjunction with accompanying drawing.

As shown in drawings, on the desk lamp that has base 1, lamp bracket 4, lampshade 5, light source 6 and power switch 2 to constitute, be provided with light modulation change-over switch 3, amplifying circuit, thyristor gating circuit and light-sensitive unit, feature of the present utility model is that amplifying circuit and thyristor gating circuit are installed in the base 1, on the face of base 1, wherein light modulation change-over switch 3 can the manual light-control knob of double as power switch 2 and light modulation change-over switch 3 devices; Light-sensitive unit is made of photosensitive probe 8 and probe holder 7, on probe holder 7, have horn mouth and form angular aperture θ, angular aperture θ can be in 30 ° of-120 ° of scopes, photosensitive probe 8 gummeds are fixed in bell-mouthed end, probe holder 7 gummeds are fixed on the inner side edge of lampshade 5, its horn mouth is towards consistent with the light direction of illumination, and guarantee source light can not direct irradiation in horn mouth.The output lead of its photosensitive probe 8 is connected with control circuit through lamp bracket 4 to base 1.

For the probe holder 7 on iiared port angle θ in 30 ° of-120 ° of scopes, the principle of its openings of sizes is, if be used to operate with special equipment on the work desk lamp, its light range of exposures is less, photosensitive probe 8 needs the scope of measurement also less, and its angular aperture θ is 30 ° and gets final product; If desk lamp on the desk, its angular aperture θ can select 90 °; And the life desk lamp that family uses is had many uses, and needs the scope of irradiation also very big, and its angular aperture θ can select 120 °.The utility model could be measured bias light more accurately according to different purposes like this, realize with an automatic light meter, reach the protection eyes purpose.And the installation site of probe holder 7 is to determine according to the structure of desk lamp itself, if lampshade 5 then can install in the limit of lampshade portion for fixture, is dismountable movable as if lampshade, then can be with the apical position of fixation base structure at light source lower end lamp bracket 4 of popping one's head in.

The utility model in use, power switch 2 is the desk lamp master switch, change-over switch 3 is the potentiometer of a belt switch, desk lamp was in state with an automatic light meter when it was in scram position, if it is when connecting, then manually light modulation continuously.Photosensitive probe changes the optical signal of measuring into the signal of telecommunication, the reference signal of demarcating with brightness together is input to error amplifying circuit, the error signal of having amplified is delivered to change-over switch 3 again, when if it is manual dimming state, its feedback signal disconnects, and can only carry out manual light modulation, if during state with an automatic light meter, error signal after the amplification can be controlled thyristor gating circuit the brightness of light source is adjusted, thereby reaches the purpose of keeping appropriate brightness.Wherein said change-over switch, amplifying circuit and thyristor gating circuit all are prior arts, are that those skilled in the art can both understand and grasp.

Claims (2)

1. desk lamp with an automatic light meter, be to have base (1), lamp bracket (4), lampshade (5), light source and power switch (2) to constitute, also be provided with light modulation change-over switch (3), amplifying circuit, thyristor gating circuit and light-sensitive unit, it is characterized in that amplifying circuit and thyristor gating circuit are installed in the base (1), power switch (2) and light modulation conversion are opened the light (3) device on the face of base (1), wherein the manual light-control knob of light modulation change-over switch (3) double as; Light-sensitive unit is made of photosensitive probe (8) and probe holder (7), have horn mouth on the probe holder (7), photosensitive probe (8) is fixed in bell-mouthed end, probe holder (7) fixture is near light source (6), its horn mouth is towards consistent with the light direction of illumination, and guarantee source light can not direct irradiation in horn mouth.

2. desk lamp according to claim 1 is characterized in that, described probe holder (7) can be arranged on the top of lamp bracket (4) or the limit portion of lampshade (5), and its probe output lead causes base (1) by lamp bracket (4) and is connected with control circuit; The iiared port angle θ of probe holder (7) is 30 °-120 °.

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