CN212361644U

CN212361644U - Flashlight can zoom

Info

Publication number: CN212361644U
Application number: CN201921557812.0U
Authority: CN
Inventors: 王海洋; 熊大曦
Original assignee: SUZHOU KEYI-SKY SEMICONDUCTOR TECHNOLOGIES Inc
Current assignee: SUZHOU KEYI-SKY SEMICONDUCTOR TECHNOLOGIES Inc
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2021-01-15
Anticipated expiration: 2029-09-19

Abstract

The application discloses a variable-focus flashlight which comprises a reflecting cup, an LED array light source module, a control circuit, protective glass, a switch and a shell, wherein the reflecting cup is arranged on the shell; the inner wall of the reflecting cup is a parabolic curved surface, and a bottom through hole is used for placing the LED array light source module; the LED array light source module light-emitting chips are arranged in a linear array or a circumferential array, the light-emitting center is arranged at the focus of the reflecting cup, and the optical axis is collinear with the symmetry axis of the reflecting cup; using a large current to light the central chip when far light is used, and using a small current to light all the chips when near light is used; the control circuit is electrically connected with the LED array light source module and can control each light-emitting chip of the LED array light source module to be respectively lightened; the switch is used for controlling the power-on and power-off of the control circuit. This application is under the prerequisite that does not change current flashlight shell, realizes the flashlight non-imaging optical design of adjustable facula size based on anti-light cup, can satisfy the far and near light illumination requirement simultaneously.

Description

Flashlight can zoom

Technical Field

The application belongs to the field of illumination, concretely relates to novel flashlight that zooms based on reflection of light cup.

Background

LEDs have advantages of small size, light weight, long lifetime, selectable wavelength, and low energy consumption, and have been widely used in the field of lighting with the reduction of chip manufacturing cost. In the design of a mainstream LED zoom flashlight, an imaging optical method of a lens or a lens group is generally used, and the method can effectively adjust the size of a light spot at a certain distance; however, since the numerical aperture of a lens is always smaller than 1, the energy efficiency of the method of using a lens or a lens group to achieve zooming tends to be low. Meanwhile, the property that parallel light is converged to a focus after being reflected by a parabola is utilized by the reflecting cup, so that zooming imaging cannot be realized, and the reflecting cup is mostly used for manufacturing fixed-focus flashlights.

Non-imaging optics are used more widely in the field of illumination. In flashlight designs, the primary solution is to maximize the delivered energy and achieve the desired illumination profile, with the reflector cup having natural advantages.

Disclosure of Invention

To overcome the defects or shortcomings of the prior art, the application provides a novel variable-focus flashlight based on a reflective cup, which improves the energy utilization rate of a light source and reduces the cost increase and the manufacturing difficulty as much as possible.

In order to solve the above technical problem, the present application has the following configurations:

a variable focus flashlight, comprising: the LED array light source module comprises a reflection cup, an LED array light source module, a control circuit, protective glass, a switch and a shell; the inner wall of the reflecting cup is a parabolic curved surface, a cavity is formed inside the reflecting cup, and a through hole at the bottom is used for placing the LED array light source module; the LED array light source module light-emitting chips are arranged in a linear array or a circumferential array, the light-emitting center is arranged at the focus of the reflecting cup, and the optical axis is collinear with the symmetrical axis of the reflecting cup; the central chip is lightened by using a large current in far light, all the chips are lightened by using a small current in near light, and the output power is reasonably controlled on the premise of meeting the illumination requirement; the control circuit is electrically connected with the LED array light source module and can independently control each light-emitting chip of the LED array light source module to be respectively lightened; the protective glass is arranged at the front end of the reflecting cup and used for protecting the coating film on the inner wall of the reflecting cup; the switch is used for controlling the power-on and power-off of the control circuit; and a cavity is formed in the shell and used for fixing the reflecting cup, the LED array light source module, the control circuit and the protective glass.

As a further improvement, the LED array light source module chip emits white light, and the light emitting color temperatures of different chips are the same or different.

As a further improvement, the LED array light source module chip emits monochromatic light, and the light emitting colors of different chips are the same or different.

As a further improvement, the LED array light source module chip is a square chip or a round chip.

As a further improvement, the inner wall of the reflecting cup is vacuum-plated with one of aluminum, chromium and zinc to improve the reflectivity.

As a further improvement, the variable-focus flashlight is provided with a battery or an external power supply.

Compared with the prior art, the method has the following technical effects:

the flashlight non-imaging optical design based on the adjustable spot size of the reflecting cup is realized on the premise of not changing the existing flashlight shell; the array of the LED chips is adjusted, so that the requirements of far and near light illumination can be met simultaneously; the purpose of short-distance and large-range illumination and long-distance illumination without increasing electric power is realized by controlling the light emission of the light source.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings, in which, obviously, the drawings in the following description are only some embodiments of the present application, and from which, without inventive step, other drawings may be derived by a person skilled in the art:

FIG. 1: the structure of the variable-focus flashlight is shown in a sectional view;

FIG. 2: the structure schematic diagram of the LED array light source module adopting the square chip and linear array mode in embodiment 1 of the present application;

FIG. 3: the method includes the steps that a light power distribution simulation diagram on a light screen at a position 2M away from an LED module is arranged below a lighting center chip in embodiment 1;

FIG. 4: the method includes the steps that a light power distribution simulation diagram on a light screen at a position 2M away from an LED module under all chips is lighted in embodiment 1;

FIG. 5: the light power distribution simulation diagram on the light screen at a position 20M away from the LED module under the lighting center chip in embodiment 1 of the application;

FIG. 6: the method includes the steps that a light power distribution simulation diagram on a light screen 20M away from an LED module under all chips is lighted in embodiment 1 of the application;

FIG. 7: the structure schematic diagram of the LED array light source module adopting the circular chip and circumferential array manner described in embodiment 2 of the present application;

FIG. 8: the method includes the steps that (1) a light power distribution simulation diagram on a light screen at a position 2M away from an LED module is arranged below a lighting center chip in embodiment 2;

FIG. 9: the method includes the steps that a light power distribution simulation diagram on a light screen at a position 2M away from an LED module under all chips is lightened in embodiment 2 of the application;

FIG. 10: the light power distribution simulation diagram on the light screen 20M away from the LED module under the lighting center chip in embodiment 2 of the present application;

FIG. 11: the method includes the steps that a light power distribution simulation diagram on a light screen 20M away from an LED module under all chips is lighted in embodiment 2;

description of the main Components

1 reflecting cup 2LED array light source module 3 control circuit 4 protection glass 5 switch 6 shell 21LED module chip 22LED module substrate

Detailed Description

The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.

Example 1

As shown in fig. 1, the variable focus flashlight of the present embodiment includes a reflective cup (1), an LED array light source module (2), a control circuit (3), a protective glass (4), a switch (5), and a housing (6); the inner wall of the light reflecting cup (1) is a parabolic curved surface, a cavity is formed inside the light reflecting cup, and a hole is formed in the bottom of the light reflecting cup and used for placing the LED array light source module (2); the LED array light source module (2) is characterized in that light emitting chips are arranged in a linear array or a circumferential array, a light emitting center is arranged at the focus of the light reflecting cup (1), and an optical axis is collinear with a symmetry axis of the light reflecting cup (1); the central chip is lightened by using a large current in far light, all the chips are lightened by using a small current in near light, and the output power is reasonably controlled on the premise of meeting the illumination requirement; the control circuit (3) is electrically connected with the LED array light source module (2) and can independently control each light-emitting chip of the LED array light source module (2) to be respectively lightened; the protective glass (4) is arranged at the front end of the reflecting cup (1) and is used for protecting the coating film on the inner wall of the reflecting cup; the switch (5) is used for controlling the power-on and power-off of the control circuit (3); and a cavity is formed in the shell (6) and used for fixing the reflection cup (1), the LED array light source module (2), the control circuit (3) and the protective glass (4).

As shown in fig. 2, the LED array light source module (2) of the present embodiment is a square chip and linear array type, and the module has 25 LED module chips (21), which emit white light and have a color temperature of 6000K.

The inner wall of the reflecting cup is plated with aluminum in vacuum, and the reflection coefficient is 70%.

The variable-focus flashlight is provided with a rechargeable lithium battery.

Comparing fig. 3 and 4, and fig. 5 and 6 respectively, it can be seen that increasing the number of LED module chips (21) cannot effectively increase the optical power of the light spot on the light screen at a certain distance, but can increase the size of the light spot. When long-distance long-focus illumination is needed, illumination at the farthest distance can be realized only by lighting the LED module chip (21) in the central area of the LED array light source module (2); when the short-distance wide-angle illumination is needed, all LED module chips (21) on the LED array light source module (2) are required to be lightened, and in addition, the damage of high brightness to eyes during short-distance illumination is avoided, and only small current input is provided when all the LED module chips (21) are lightened, so that the input electric power of a flashlight can not be increased by increasing the number of the LED module chips (21), and the whole heat dissipation and partial mechanical structure of the existing flashlight are not required to be changed.

Example 2

As shown in fig. 7, the LED array light source module (2) of the present embodiment is a circular chip and circular array type, and the module has 25 LED module chips (21) in total, which emit red light with a main wavelength of 630nm and a full width at half maximum of 20 nm.

The inner wall of the reflecting cup is plated with aluminum in vacuum, and the reflection coefficient is 75%.

The variable-focus flashlight is provided with a rechargeable lithium battery and can be directly connected with a rechargeable power supply.

Comparing fig. 8 and 9, and fig. 10 and 11, respectively, it can be seen that increasing the number of LED module chips (21) is not effective to increase the optical power of the light spot on the light screen at a certain distance, but can increase the size of the light spot. When long-distance long-focus illumination is needed, illumination at the farthest distance can be realized only by lighting the LED module chip (21) in the central area of the LED array light source module (2); when the short-distance wide-angle illumination is needed, all LED module chips (21) on the LED array light source module (2) are required to be lightened, and in addition, the damage of high brightness to eyes during short-distance illumination is avoided, and only small current input is provided when all the LED module chips (21) are lightened, so that the input electric power of a flashlight can not be increased by increasing the number of the LED module chips (21), and the whole heat dissipation and partial mechanical structure of the existing flashlight are not required to be changed.

The flashlight non-imaging optical design based on the adjustable spot size of the reflecting cup is realized on the premise of not changing the existing flashlight heat dissipation structure; this application can satisfy the far and near light illumination requirement simultaneously through the range of adjustment LED chip, has good application prospect.

The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.

Claims

1. A variable focus flashlight, comprising:

the LED light source module comprises a light reflecting cup (1), an LED array light source module (2), a control circuit (3), protective glass (4), a switch (5) and a shell (6);

the inner wall of the light reflecting cup (1) is a parabolic curved surface, a cavity is formed inside the light reflecting cup, and a hole is formed in the bottom of the light reflecting cup and used for placing the LED array light source module (2);

the LED array light source module (2) is characterized in that light emitting chips are arranged in a linear array or a circumferential array, a light emitting center is arranged at the focus of the light reflecting cup (1), and an optical axis is collinear with a symmetry axis of the light reflecting cup (1); the central chip is lightened by using a large current in far light, all the chips are lightened by using a small current in near light, and the output power is reasonably controlled on the premise of meeting the illumination requirement;

the control circuit (3) is electrically connected with the LED array light source module (2) and can independently control each light-emitting chip of the LED array light source module (2) to be respectively lightened;

the protective glass (4) is arranged at the front end of the reflecting cup (1) and is used for protecting the coating film on the inner wall of the reflecting cup;

the switch (5) is used for controlling the power-on and power-off of the control circuit (3);

and a cavity is formed in the shell (6) and used for fixing the reflection cup (1), the LED array light source module (2), the control circuit (3) and the protective glass (4).

2. The variable-focus flashlight of claim 1, wherein the LED array light source module (2) chips emit white light, and the color temperature of light emitted by different chips is the same or different.

3. The variable-focus flashlight of claim 1, wherein the LED array light source module (2) emits monochromatic light, and the light emitting colors of different chips are the same or different.

4. The variable-focus flashlight of claim 1, wherein the LED array light source module (2) chip is a square chip or a circular chip.

5. The variable-focus flashlight of claim 1, wherein the variable-focus flashlight has a battery or an external power source.