CN108180411B

CN108180411B - Brightness adjusting method of desk lamp

Info

Publication number: CN108180411B
Application number: CN201810128558.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Chen An
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2020-11-17
Anticipated expiration: 2032-12-21
Also published as: CN103883922B; CN108180411A; CN103883922A

Abstract

A brightness adjusting method of a desk lamp comprises a hollow lamp shell, a light emitting diode module, a lens module, a lamp holder and an automatic control module, wherein the light emitting diode module is accommodated in the lamp shell, the lens module covers the light emitting diode module, the lamp holder is used for supporting the lamp shell, the automatic control module is used for adjusting the light emitting brightness of the light emitting diode module and comprises a photosensitive component, a control component and a brightness adjusting component, the photosensitive component converts brightness value data into signals after acquiring the brightness value data and transmits the signals to the control component, the control component sends an instruction to the brightness adjusting component by comparing the brightness value data with preset brightness value data, and the brightness adjusting component increases or decreases the intensity of light emitted by the light emitting diode module by adjusting the current passing through the light emitting diode module. Compared with the prior art, the light-emitting diode desk lamp comprises the automatic control module for adjusting the light-emitting brightness of the light-emitting diode module, and the illumination brightness of the desk lamp can be automatically adjusted according to preset brightness value data.

Description

Brightness adjusting method of desk lamp

The application has the following application numbers: 201210560875.8, filing date: 12/21/2012, the invention is entitled "light emitting diode desk lamp".

Technical Field

The invention relates to the field of semiconductor lighting, in particular to a light-emitting diode desk lamp.

Background

As an efficient light source, a Light Emitting Diode (LED) has many characteristics such as environmental protection, power saving, and long service life, and has been widely used in various fields. The LED solid-state light source can generate higher brightness, can realize indoor and outdoor illumination, and can replace the existing light sources such as incandescent lamps, fluorescent lamps and the like, thereby being widely applied.

A common led desk lamp usually comprises a plurality of led elements. In order to achieve sufficient light intensity, the led elements are usually arranged in a dense array. However, since the light emitted from the led device usually has a strong directivity, the led desk lamp generates a strong brightness when irradiated to the working plane, and a manual brightness adjusting knob is usually added to the led desk lamp for adjusting the illumination brightness. Thus, on one hand, the manual operation of the user is required, which is inconvenient and different for different users; on the other hand, when the brightness of the surrounding environment changes after manual adjustment, if the surrounding environment becomes bright or dark, the illumination brightness needs to be adjusted, and only the led desk lamp needs to be adjusted again, which is troublesome to operate and difficult to obtain better illumination brightness.

Disclosure of Invention

In view of the above, it is desirable to provide an led desk lamp capable of automatically adjusting the illumination brightness.

An LED desk lamp comprises a hollow lamp shell, an LED module contained in the lamp shell, a lens module covering the LED module and a lamp holder for supporting the lamp shell, the LED desk lamp also comprises an automatic control module for adjusting the light-emitting brightness of the LED module, the automatic control module comprises a photosensitive component for sensing the light intensity, a control component for receiving signals transmitted by the photosensitive component and a brightness adjusting component for receiving instructions of the control component, the photosensitive component obtains the brightness value data and converts the brightness value data into a signal to be transmitted to the control component, the control component sends an instruction to the brightness adjusting component by comparing the brightness value data with preset brightness value data, the brightness adjusting component is used for increasing or reducing the intensity of light rays emitted by the light emitting diode module by adjusting the current passing through the light emitting diode module.

Compared with the prior art, the light-emitting diode desk lamp comprises the automatic control module for adjusting the light-emitting brightness of the light-emitting diode module, and the illumination brightness of the desk lamp can be automatically adjusted according to preset brightness value data.

The invention will be further described with reference to embodiments with reference to the drawings.

Drawings

Fig. 1 is an assembly schematic diagram of an led desk lamp according to an embodiment of the invention.

Fig. 2 is a schematic cross-sectional view of the light emitting diode lamp shown in fig. 1 taken along line II-II in fig. 1.

Fig. 3 is a perspective view of a lens of the led desk lamp shown in fig. 2.

Fig. 4 is a schematic cross-sectional view of the lens shown in fig. 3, taken along the line IV-IV in fig. 3.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Referring to fig. 1 and fig. 2, an led desk lamp 100 according to an embodiment of the present invention includes a hollow lamp housing 10, an led module 20 accommodated in the lamp housing 10, a lens module 30 covering the led module 20, a lamp holder 40 for supporting the lamp housing 10, and an automatic control module 50 for adjusting the brightness of the led module 20.

The lamp housing 10 may be integrally made of glass, resin, plastic, metal, or the like. The lamp housing 10 has a substantially oval outline and an opening (not labeled) at the bottom thereof for emitting light emitted from the led module 20.

The led module 20 includes a longitudinal strip-shaped circuit board 22 and a plurality of leds 24 attached to the circuit board 22 at regular intervals. The circuit board 22 is disposed in the lamp housing 10. The light emitting diode 24 is disposed facing the opening of the lamp housing 10. The number of leds 24 may vary depending on the specific power of the led desk lamp 100.

The lens module 30 is correspondingly covered on the led module 20 to improve the light emitting effect of the led module 20, and includes a plurality of lenses 32 correspondingly matched with the leds 24 one by one, and a pressing plate 34 for fixing the lenses 32 on the circuit board 22. The lens 32 is integrally formed of a transparent material having good optical properties, such as PMMA or PC plastic. Each lens 32 is placed over a corresponding one of the leds 24. The pressing plate 34 is a strip-shaped flat plate, and a plurality of circular assembling holes (not labeled) are uniformly formed on the pressing plate 34 at intervals so that the lens 32 can correspondingly penetrate through the circular assembling holes. The fitting hole is sized to correspond to the lens 32 so that the light guide portion of the lens 32 can pass through the fitting hole while the outer peripheral edge of the lens 32 is caught by the peripheral edge of the fitting hole. The pressing plate 34 is fixed on the circuit board 22 by a plurality of fixing members (not shown), and horizontally presses the lens 32 on the circuit board 22 of the led module 20.

Referring to fig. 3 and fig. 4, the lens 32 includes a first curved surface 321, a second curved surface 322, and a connecting surface 323 connecting the first curved surface 321 and the second curved surface 322. The second curved surface 322 is disposed above the first curved surface 321, and the bottom peripheries of the two curved surfaces are located on the same plane and connected by a connecting surface 323. The first curved surface 321 directly covers the light emitting diode 24. The first curved surface 321 includes a curved inner wall 3211 and a tip portion 3212 recessed from the connecting surface 323 toward the inside of the lens 32, and the curved inner wall 3211 and the tip portion 3212 are smoothly connected. The contour of the curved inner wall 3211 is generally an ellipsoid, and the tip 3212 is formed by further recessing from the top of the curved inner wall 3211 toward the solid interior of the lens 32. The slope of the cross section of the curved inner wall 3211 in the optical axis direction of the lens 32 is gradually decreased by the connecting surface 323, and the slope of the cross section of the tip portion 3212 in the optical axis direction of the lens 32 is gradually increased by the curved inner wall 3211. The vertex of the first curved surface 321 is the vertex of the tip portion 3212, and is located on the optical axis of the lens 32. The bottom periphery of the first curved surface 321 is located on the connecting surface 323, i.e. the bottom end of the curved inner wall 3211 is located on the connecting surface 323. When the light emitted from the led 24 is emitted to the first curved surface 321, the forward light is refracted by the tip portion 3212 and then deflected to the side of the lens 32, so that the forward outgoing light is laterally dispersed toward the lens 32, which is beneficial to uniformizing the outgoing light.

The second curved surface 322 is disposed above the first curved surface 321. The center point of the second curved surface 322 is located on the optical axis of the lens 32. The second curved surface 322 includes a concave surface 3221 at the center of the top, a curved surface 3222 at the periphery of the concave surface 3221, and a side surface 3223 around the side of the lens 32. The concave surface 3221 is located at the center of the lens 32 and opposite to the vertex of the first curved surface 321. The concave surface 3221 may be a concave arc surface or the like for diverging the forward light reaching the concave surface 3221. The curved surface 3222 is a convex curved surface, and the curvature of the curved surface 3222 is greater than that of the concave surface 3221. The bottom periphery of the second curved surface 322 and the bottom periphery of the first curved surface 321 are located on the connecting surface 323, and the two are connected by the connecting surface 323.

The connecting surface 323 is close to the light emitting diode 24, and a plurality of staggered convex strips are convexly arranged on the connecting surface 323 towards the direction far away from the second curved surface 322, and the connecting surface 323 comprises a plurality of first convex strips 3231 and a plurality of second convex strips 3232. The plurality of first ribs 3231 are spaced apart from each other in parallel, and the plurality of second ribs 3232 are spaced apart from each other in parallel. Each of the first ribs 3231 has the same shape as each of the second ribs 3232, and is a half cylinder. The second ribs 3232 are parallel to each other and vertically staggered with the first ribs 3231. The first convex strips 3231 and the second convex strips 3232 are staggered with each other to form a substantially "well". When the light emitted from the led 24 is emitted toward the lens 32, a portion of the light is reflected by the first protruding strip 3231 and the second protruding strip 3232 and then emitted to different angles when the light is emitted toward the connecting surface 323 inside the lens 32, so as to increase the light emitting angle of the emitted light and make the emitted light more uniform.

The lamp holder 40 includes a disc-shaped base 42, a supporting portion 44 vertically disposed on the base 42, and a connecting rod 46 extending upward from the supporting portion 44 and connected to the lamp housing 10. The base 42 and the support 44 may be made of plastic, metal, etc. integrally. The connecting rod 46 and the supporting portion 44 are movably connected, such as pivotally connected or connected by a link. The connecting rod 46 may also be a flexible rod. Thus, by adjusting the relative positions of the connecting rod 46, the base 42 and the supporting portion 44, the light emitting direction or the light emitting position of the led module 20 in the lamp housing 10 can be flexibly adjusted to meet the actual needs of the user.

The automatic control module 50 includes a photosensitive device 52, a control device 54 and a brightness adjusting device 56. The photosensitive assembly 52 is disposed on the lamp housing 10 and outside the illumination range of the led module 20, and is used for receiving the light returned by the led module 20 after being reflected by the working plane (e.g. desktop) where the led desk lamp 100 is located. The height of the photosensitive element 52 is approximately consistent with the height of the eyes of the user, so as to obtain the required brightness value data. The light sensing component 52 obtains the brightness value data and converts the brightness value data into a signal to be transmitted to the control component 54, the control component 54 sends an instruction to the brightness adjusting component 56 by comparing the brightness value data with preset brightness value data, and the brightness adjusting component 56 adjusts the current passing through the light emitting diode module 20 according to the instruction of the control component 54 so as to increase or decrease the intensity of the light emitted by the light emitting diode module 20. When the brightness value data obtained by the photosensitive element 52 matches the preset brightness value data, the control element 54 stops sending the instruction to the brightness adjusting element 56, and the led module 20 operates stably. When the situation changes during the use, if the ambient illumination changes, such as other light sources are added to the illumination, the automatic control module 50 repeats the above adjustment process. In addition, the led desk lamp 100 may further include a manual/automatic control selection element 60 and a manual control brightness knob 70. The user can adjust the brightness of the led module 20 by manually controlling the brightness knob 70 in a manual control manner.

It can be understood that the number of the automatic control modules 50 may be multiple, the number of the led modules 20 is multiple, wherein each automatic control module 50 corresponds to one led module 20, the photosensitive component 52 in each automatic control module 50 correspondingly obtains brightness data of one region, and the brightness adjusting component 56 correspondingly adjusts the light emitting intensity of the led module 20 according to the instruction of the control component 54, so that the brightness value in the whole irradiation range of the led desk lamp 100 can be finely adjusted by the multiple automatic control modules 50, and further the optimal lighting effect can be obtained.

It is understood that various other changes and modifications may be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.

Claims

1. The brightness adjusting method of the desk lamp comprises a light emitting diode module, an automatic control module comprises a photosensitive assembly, a control assembly and a brightness adjusting assembly, and is characterized in that: the brightness adjusting method of the desk lamp comprises the following steps:

the photosensitive assembly senses the light intensity to obtain required brightness value data, and the obtained brightness value data is converted into signals to be transmitted to the control assembly;

the control component sends an instruction to the brightness adjusting component by comparing the brightness value data with preset brightness value data;

the brightness adjusting component adjusts the current passing through the light-emitting diode module according to the instruction of the control component so as to increase or reduce the intensity of light rays emitted by the light-emitting diode module;

the light-emitting diode module comprises a circuit board and a light-emitting diode attached to the circuit board; the lens module comprises lenses which are correspondingly matched with the light-emitting diodes one by one and a pressing plate which is used for fixing the lenses on the circuit board; the lens comprises a first curved surface and a second curved surface which are sequentially covered on a light source, wherein the bottom periphery of the first curved surface and the bottom periphery of the second curved surface are on the same horizontal plane and are connected into a connecting surface, a plurality of first convex strips and a plurality of second convex strips are formed on the connecting surface, the first convex strips are parallel to each other and spaced, the second convex strips are parallel to each other and spaced, and the first convex strips and the second convex strips are arranged in a staggered manner; the first curved surface of the lens comprises a curved inner wall and a tip part, wherein the curved inner wall and the tip part are formed by sinking towards the inside of the solid body of the lens from the connecting surface, the tip part is positioned at the top of the curved inner wall, the slope of the section of the curved inner wall along the axial direction of the lens is gradually reduced by the connecting surface, and the slope of the section of the tip part along the axial direction of the lens is gradually increased by the curved inner wall.

2. The method for adjusting brightness of a desk lamp according to claim 1, wherein the method for adjusting brightness of a desk lamp further comprises: and when the brightness value data obtained by the photosensitive assembly conforms to the preset brightness value data, the control assembly stops sending an instruction to the brightness adjusting assembly, and the light emitting diode module works stably.

3. The method for adjusting brightness of a desk lamp according to claim 2, wherein the desk lamp further comprises a hollow lamp housing, a lens module covering the led module, and a lamp holder for supporting the lamp housing; the light sensing assembly is arranged on the lamp shell, is positioned outside the irradiation range of the light emitting diode module and is used for receiving and sensing the light returned by the light emitted by the light emitting diode module after being reflected by the working plane where the light emitting diode desk lamp is positioned.

4. The brightness adjusting method of the desk lamp according to claim 3, wherein: the quantity of automatic control module group is a plurality of, the quantity of emitting diode module group corresponds to a plurality of, and wherein every automatic control module group corresponds the intensity that an automatic adjustment emitting diode module group sent light.

5. The brightness adjusting method of the desk lamp according to claim 3, wherein: the lamp holder comprises a base, a supporting part arranged on the base and a connecting rod extending out from the supporting part and connected with the lamp shell.

6. The brightness adjusting method of the desk lamp according to claim 1, wherein: a plurality of circular assembling holes are arranged on the pressing plate at intervals so that the lenses can be correspondingly arranged in the circular assembling holes.

7. The brightness adjusting method of the desk lamp according to claim 1, wherein: the second curved surface of lens is established in first curved surface top, and this second curved surface is including the side that is located the concave surface of top central authorities, concave surface outlying cambered surface and encircles the lens lateral part, and this concave surface is sunken towards the direction of light source, and this cambered surface is to keeping away from the direction protrusion of light source, and the bottom edge of this side is located and connects the face.