TWI789982B - Light source device - Google Patents

Abstract

A light source device is provided, including a lamp cover. The lamp cover has a light entering surface and a light leaving surface. The light entering surface surrounds an accommodating space and has a parabolic curve, wherein the light entering surface is a surface protruding toward the accommodating space, and the accommodating space is configured to receive a plurality of light emitting members. The light leaving surface is opposite to the light entering surface, and has an aspheric surface.

Description

Light source device

The invention relates to a light source device. More specifically, the present invention relates to a light source device providing uniform illuminance.

With the advancement of science and technology, people's requirements for light-emitting devices are increasing day by day, not only requiring high luminous efficacy, but also requiring low power consumption. Therefore, light-emitting diode (LED) technology has attracted more and more attention. The advantages of light-emitting diodes are high luminous efficiency, fast response time, long service life and no mercury. In addition, light-emitting diodes also have the advantages of mechanical shock resistance, small size, and wide color gamut. Therefore, light-emitting diodes are gradually replacing traditional light-emitting devices. With the rapid development of light-emitting diodes in recent years, the application fields of light-emitting diodes have been greatly expanded, and they have become a new type of light source in the 21st century. As far as the application of the light source is concerned, the luminous efficiency is a key product specification, so many researchers have devoted themselves to improving the luminous efficiency of light-emitting diodes.

However, even if the aforementioned light-emitting diodes are used, the existing light-emitting devices can only generate sufficient illumination intensity near the optical axis, which cannot meet the occasions that require a larger illumination range and/or provide uniform illumination. Therefore, how to solve the foregoing problems becomes an important issue.

In order to solve the above conventional problems, the present invention provides a light source device. The aforementioned light source device includes a lamp housing, and the lamp housing includes a light incident surface and a light exit surface. The light-incident surface surrounds an accommodating space and has a parabolic curve, wherein the light-incident surface is a surface protruding toward the accommodating space, and the accommodating space can be used to accommodate a plurality of light-emitting elements. The light emitting surface is opposite to the light incident surface, and has an aspheric curve.

The light source device of the present invention will be described below. It should be readily appreciated, however, that the present invention provides many suitable inventive concepts that can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of specific ways to use the invention and do not limit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the related art and the present invention, and should not be interpreted in an idealized or overly formal manner Interpretation, unless specifically defined herein.

The following disclosures in this specification describe specific examples of each component and its arrangement in order to simplify the description of the invention. Of course, these specific examples are not intended to limit the present invention. For example, if the following disclosure in this specification describes that a first feature is formed on or above a second feature, it means that it includes the embodiment in which the above-mentioned first feature and the above-mentioned second feature are formed in direct contact , also includes an embodiment in which additional features may be formed between the above-mentioned first feature and the above-mentioned second feature, so that the above-mentioned first feature and the above-mentioned second feature may not be in direct contact. Furthermore, for convenience in describing the relationship of one feature to another in the drawings, spatial relative terms such as "below", "below", "under", "above", "above", and the like may be used. terminology etc. Spatially relative terms encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise positioned (rotated 90 degrees or at other orientations) as well, and the spatially relative descriptions used herein should be read accordingly.

Fig. 1 shows a light source device E according to an embodiment of the present invention. The aforementioned light source device E can be, for example, a lamp, and can provide uniform light to external objects. For example, the light provided by the light source device E can be used to illuminate plants, or can be used on traffic signs, but is not limited thereto.

The light source device E includes, for example, a lamp housing 100 , a plurality of light emitting elements 200 , a heat dissipation element 300 , and a lamp base 400 , wherein the heat dissipation element 300 is connected to the lamp housing 100 and the lamp base 400 and is disposed between the lamp housing 100 and the lamp base 400 . The light emitting element 200 contacts the heat dissipation element 300 and is covered by the lamp housing 100 . In this embodiment, the heat dissipation element 300 includes a plurality of heat dissipation fins 310 , the heat energy generated by the light emitting element 200 can be conducted to the heat dissipation element 300 and dissipated into the air through the heat dissipation fins 310 . The light emitted by the light-emitting element 200 can pass through the lamp housing 100 , and the lamp housing 100 can evenly spread the aforementioned light.

FIG. 2 is a cross-sectional view of the aforementioned lamp housing 100 . As shown in FIG. 1 and FIG. 2 , the lamp housing 100 includes a light incident surface 110 , a top surface 120 , and a light output surface 130 .

，其中C、k、h為拋物線參數。 The light incident surface 110 surrounds an open accommodating space S and is connected to the top surface 120 . In this embodiment, the light-incident surface 110 is a surface protruding toward the accommodating space S, and has a parabolic curve. For example, the parabolic curve of the light incident surface 110 may conform to the following formula:

, where C, k, and h are parameters of the parabola.

The top surface 120 is a plane facing the accommodating space S. As shown in FIG. In this embodiment, the top surface 120 has a circular surface, and the optical axis AX of the light source device E passes through the center of the circular surface and is perpendicular to the top surface 120 . When the light incident surface 110 and the top surface 120 are projected onto a virtual plane P parallel to the top surface 120, the light incident surface 110 and the top surface 120 respectively have a first width W1 and a second width W2, and the second width W2 is 1/3˜1/5 (for example, 1/4) of the first width W1.

，其中X表示該出光面平行於光軸之表面輪廓，r表示與該光學元件之光軸AX之間的距離，c表示曲率，K表示圓錐常數，且α ₁、α ₂、α ₃、α ₄表示非球面係數。 The light emitting surface 130 faces away from the accommodating space S, in other words, the light emitting surface 130 is opposite to the light incident surface 110 . The light-emitting surface 130 has an aspheric curve. In this embodiment, the light-emitting surface 130 has a recess 131 corresponding to the accommodating space S, so the optical axis AX of the light source device E also passes through the recess 131 . The aspherical curve of the light-emitting surface 130 may conform to the following formula, for example:

, where X represents the surface profile of the light-emitting surface parallel to the optical axis, r represents the distance from the optical axis AX of the optical element, c represents the curvature, K represents the conic constant, and α ₁ , α ₂ , α ₃ , α ₄ represents the aspheric coefficient.

In this embodiment, when the light emitting surface 130 is projected onto the virtual plane P parallel to the top surface 120, the light emitting surface 130 has a third width W3, and the first width W1 is 1/3~1/5 of the third width W3 , and the height T of the light emitting surface 130 in the direction of the optical axis AX is 1/2˜1/4 of the third width W3.

Please refer to FIG. 1 to FIG. 3 together. The light emitting elements 200 are accommodated in the accommodating space S and arranged in a matrix.

The light emitting element 200 may include light emitting elements 200 emitting light of different wavelengths. For example, the light emitting element 200 may include a red light emitting element emitting red light (with a wavelength of 660 nm), a blue light emitting element emitting blue light (with a wavelength of 465 nm), and/or a white light emitting element emitting white light. The number of various light-emitting elements can be adjusted using demand. In this embodiment, the light source device E only includes a red light emitting element 210 emitting red light and a blue light emitting element 220 emitting blue light, and by adjusting the number of red light emitting elements 210 and the number of blue light emitting elements 220, the red The ratio of the light radiation intensity generated by the light emitting element 210 and the blue light emitting element 220 is 1:2. In some embodiments, the ratio of the light radiation intensities of the red light emitting element 210 and the blue light emitting element 220 can be adjusted to 1:1 or 1:0.5, but it is not limited thereto.

The light emitting element 200 may include a suitable illuminant, for example, the light emitting element 200 may include a light-emitting diode (LED). Light-emitting diodes may, for example, include inorganic light-emitting diodes, organic light-emitting diodes (Organic Light-Emitting Diode, OLED), submillimeter light-emitting diodes (mini LEDs), micro light-emitting diodes (micro LEDs), quantum Quantum Dots Light-Emitting Diodes (Quantum Dots Light-Emitting Diode, QLED or QD-LED), other suitable light-emitting diodes, or a combination of the above, but not limited thereto.

The light provided by the light emitting element 200 can enter the lamp housing 100 through the light incident surface 110 or the top surface 120 , and then leave the lamp housing 100 through the light emitting surface 130 . Since the refractive index of the lamp housing 100 is different from that of the air, the light moving through the aforementioned path will be refracted twice, so that the emission angle of the light can be adjusted to achieve the purpose of light splitting. For example, the lamp housing 100 may include plastic or glass.

In this embodiment, the light incident surface 110 and the light exit surface 130 are rotationally symmetric at any angle with respect to the optical axis AX of the light source device E (rotational symmetry of any order), therefore, in the light source device E Provides uniform illuminance of light in all directions.

As shown in Figure 4A, the peak angle of the light intensity provided by a general lamp will fall at 0 degrees, that is, most of the light from the lamp will fall directly below the optical axis, and the farther away from the optical axis, the less light will be . Conversely, as shown in FIG. 4B, the light intensity peak angle of the light source device E in FIG. 1 of the present invention can fall within 22 degrees to 54 degrees, so the light can be evenly distributed.

Please refer to Figure 5. Curve L1 represents the illuminance curve of a general lamp at a plane 1 meter away from the light source. Curve L2 represents the illuminance curve of the light source device E in the aforementioned Figure 1 at a plane 1 meter away from the light source. The dotted line D represents the effective irradiation intensity. It can be seen from the figure that the general luminaire has a higher illuminance (normalize) at the optical axis, but the illuminance will drop rapidly after leaving the optical axis, so the effective illuminance range is only about one meter away from the optical axis. Inside. In contrast, the illuminance of the aforementioned light source device E of the present invention at the optical axis is lower than that of ordinary lamps, but the illuminance is evenly distributed, so the effective illuminance range can be extended to a range of about two meters from the optical axis.

Fig. 6 and Fig. 7 are schematic diagrams and top views showing a light source device E' of another embodiment of the present invention. As shown in Figures 6 and 7, the light source device E' mainly includes a lamp housing 100, a plurality of light emitting elements 200, a heat dissipation element 300, and a lamp holder 400, wherein the lamp housing 100, the heat dissipation element 300, and the lamp holder 400 The structure and configuration are completely the same as the lamp housing 100, heat dissipation element 300, and lamp holder 400 of the light source device E in Fig. 1, so details are not repeated here.

Different from the aforementioned light source device E, in the light source device E', some of the light emitting elements 200 are arranged at equal intervals along a first circular path R1, and some of the light emitting elements 200 are arranged along a second circular path R2, etc. The first circular path R1 and the second circular path R2 are arranged at intervals, and the aforementioned first circular path R1 and the second circular path R2 are concentric circles with different diameters. In this embodiment, the optical axis AX passes through the centers of the concentric circles, and a light emitting element 200 is also disposed at the centers of the concentric circles.

Through the arrangement of the light emitting elements 200, the number of light emitting elements 200 can be increased, the light intensity of a single light source device E can be enhanced, the size of the light source device E can be reduced, and the manufacturing cost of the light source device E can be reduced.

As long as the features of the aforementioned embodiments do not violate the spirit of the invention or conflict with each other, they can be mixed and matched arbitrarily.

To sum up, the present invention provides a light source device. The aforementioned light source device includes a lamp housing, and the lamp housing includes a light incident surface and a light exit surface. The light-incident surface surrounds an accommodating space and has a parabolic curve, wherein the light-incident surface is a surface protruding toward the accommodating space, and the accommodating space can be used to accommodate a plurality of light-emitting elements. The light emitting surface is opposite to the light incident surface, and has an aspheric curve.

Although the embodiments of the present invention and their advantages have been disclosed above, it should be understood that those skilled in the art can make changes, substitutions and modifications without departing from the spirit and scope of the present invention. In addition, the protection scope of the present invention is not limited to the process, machine, manufacture, material composition, device, method and steps in the specific embodiments described in the description, and anyone with ordinary knowledge in the technical field can learn from the disclosure of the present invention It is understood that the current or future developed processes, machines, manufactures, material compositions, devices, methods and steps can be used in accordance with the present invention as long as they can perform substantially the same functions or obtain substantially the same results in the embodiments described herein. Therefore, the protection scope of the present invention includes the above-mentioned process, machine, manufacture, composition of matter, device, method and steps. In addition, each patent application scope constitutes an individual embodiment, and the protection scope of the present invention also includes the combination of each patent application scope and the embodiments.

Although the present invention is disclosed above with the aforementioned several preferred embodiments, they are not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application. In addition, each claimed claim constitutes an independent embodiment, and combinations of various claimed claims and embodiments fall within the scope of the present invention.

100: lamp housing

110: incident surface

120: top surface

130: light emitting surface

131: depression

200: light emitting element

210: red light emitting element

220: blue light emitting element

300: cooling element

310: cooling fins

400: Lamp holder

AX: optical axis

D: dotted line

E, E': light source device

L1: curve

L2: curve

P: virtual plane

R1: first circular path

R2: second circular path

S: storage space

T: height

W1: first width

W2: second width

W3: third width

Embodiments of the present invention can be better understood according to the following detailed description and accompanying drawings. It should be noted that, in accordance with the standard practice in the industry, various features in the drawings have not necessarily been drawn to scale. In fact, the dimensions of the various features may be arbitrarily expanded or reduced for clarity of illustration. Fig. 1 is a schematic diagram showing a light source device in an embodiment of the present invention. Fig. 2 is a schematic view showing a lamp housing in an embodiment of the present invention. Fig. 3 is a top view showing a light source device in an embodiment of the present invention. Figure 4A is a schematic diagram showing the peak light intensity of a general lamp. FIG. 4B is a schematic diagram showing the peak light intensity of a light source device according to an embodiment of the present invention. Fig. 5 is a plane distribution diagram of illuminance of a light source device in an embodiment of the present invention. Fig. 6 is a schematic view showing a light source device in another embodiment of the present invention. Fig. 7 is a top view showing a light source device in another embodiment of the present invention.

100: lamp housing

110: incident surface

120: top surface

130: light emitting surface

131: depression

AX: optical axis

P: virtual plane

S: storage space

T: height

W1: first width

W2: second width

W3: third width

Claims (11)

A light source device, comprising: a lamp housing, comprising: a light-incident surface surrounding an accommodating space and having a parabolic curve, wherein the light-incident surface is a surface convex toward the accommodating space, and the accommodating space is It is used to accommodate a plurality of light-emitting elements; a light-emitting surface is opposite to the light-incident surface and has an aspherical curve; and a top surface is connected to the light-incidence surface and faces the accommodating space, and the top surface is a plane, Wherein an optical axis of the light source device passes through the top surface, and the top surface is perpendicular to the optical axis of the light source device. The light source device as claimed in item 1, wherein the parabolic curve conforms to the following formula:

, where C, k, and h are parameters of the parabola. The light source device as claimed in item 1, wherein the aspheric curve conforms to the following formula:

, where X represents the surface profile of the light-emitting surface, r represents the distance from one of the optical axes of the optical element, c represents the curvature, K represents the conic constant, and α ₁ , α ₂ , α ₃ , α ₄ represent aspheric surfaces coefficient. The light source device according to claim 1, wherein when the light incident surface is projected onto a virtual plane parallel to the top surface, the light incident surface has a first width, and when the top surface is projected onto the virtual plane, the light incident surface The top surface has a second width, wherein the second width is 1/3˜1/5 of the first width. The light source device according to claim 1, wherein when the light incident surface is projected onto a virtual plane perpendicular to the optical axis of the light source device, the light incident surface has a first width, and when the light exit surface is projected onto the virtual plane When flat, the light emitting surface has a third width, wherein the first width is 1/3˜1/4 of the third width. The light source device according to claim 1, wherein when the light exit surface projects a virtual plane perpendicular to the optical axis of the light source device, the light exit surface has a third width, and in the direction of the optical axis, the light exit surface has A height, wherein the height is 1/2˜1/4 of the third width. The light source device according to claim 1, wherein the light emitting surface has a concave portion corresponding to the accommodating space. The light source device according to claim 1, wherein a part of the light-emitting elements is arranged along a first circular path, and another part of the light-emitting elements is arranged along a second circular path, wherein the first circular path and the second circular path are concentric circles. The light source device according to claim 1, wherein the light emitting elements arranged along the first circular path are equidistant from each other, and the light emitting elements arranged along the second circular path are equidistant from each other. The light source device according to claim 1, wherein the light-emitting elements include a plurality of red light-emitting elements and a plurality of blue light-emitting elements, and the ratio of light radiation intensity between the red light-emitting elements and the blue light-emitting elements is 1:2 , 1:1, or 1:0.5. The light source device according to claim 1, wherein the light incident surface and the light exit surface are rotationally symmetric at any angle (rotational symmetry of any order).

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