TWI417529B - Goniophotometry testing apparatus - Google Patents

Description

Distributed photometric test device

The invention relates to a light source measuring device, in particular to a distributed photometric testing device.

Lumen, lm can be tested by Integrating Sphere Testing or Goniophotometry Testing. The total luminous flux of a small-sized illuminating source module or luminaire is usually integrated. In the measurement, the inner diameter of the integrating sphere must be more than three times the maximum size of the light source module. The integrating sphere test method is to place the light source module on the edge of the integrating sphere, and only allow the light emitting surface of the light source to be exposed in the integrating sphere, and the area or electronic components of the other non-lighting surface are uniformly covered by a white diffusing plate. After the illumination source system satisfies the conditions of thermal equilibrium and optical characteristics, the total luminous flux measurement is performed by comparison with a standard light source.

The large-size illumination source module cannot be measured due to the integration sphere size limitation. After the light distribution curve is obtained by the goniophotometer test method, the total luminous flux is calculated by the integration method. In the measurement configuration of the measurement light distribution curve, under the condition of far field, the measurement distance is at least 10 times larger than the maximum size of the illumination plane of the illumination source module, so that the illumination source module is regarded as a point. light source. When measuring, a Goniophotometer was used for measurement.

A conventional distributed photometer, such as the rotating mirror-type distribution photometer shown in FIG. A, has three rotation axes in the photometric test system 100. The main shaft 108 drives the mirror 102 to rotate around the central optical axis to reflect the light of the lamp 104. To the photo sensor 106. At this time, the lamp arm adjustment shaft 110 rotates synchronously, and the lamp holder is always in the vertical position, ensuring that the test lamp is in a normal point position during the measurement. The rotation of the lamp holder shaft (C-axis) 112 is actually equivalent to the vertical spherical rotation of the light sensor around the luminaire, and the measurement of the luminaire in the C direction is achieved, and its trajectory is equivalent to the latitude of the earth. The rotation of the main shaft realizes the measurement of the luminaire in the γ direction, and its trajectory is equivalent to the warp direction of the earth.

In addition, as shown in FIG. 1B, the rotating mirror-type distribution photometer 200 has its photo sensor 206 fixed on the ray axis 208, the luminaire 204 rotates about the vertical axis 210, and the mirror 202 rotates around the luminaire and the optical signal Reflected onto the photo sensor 206. In this system, the measurement is incident at a certain conical angle with the normal of the photosensor, and the angular response of the photosensor is highly demanded. A baffle must be used between the light source and the sensor so that the light from the source is not directly incident on the photo sensor.

In addition, such as the remote company's distributed photometer product (US public number US. Pub. No. 20080304049), the way is to use the double-sided mirror to measure the light intensity, so the speed is slow and requires a considerable venue, and another such as Oss OSRAM's distributed photometer product (US public number US Pat. No. 20060223222) is a method of measuring the light intensity of a side light source by using a double boom.

In one embodiment, the present invention provides a distributed photometric test apparatus, comprising: a light source holding portion; a first rotating portion coupled to the light source holding portion, wherein the first rotating portion provides a The first rotational power causes the light source holding portion to generate a rotational motion about a first axis; a second rotational portion coupled to the first rotational portion, the second rotational portion provides a second rotational power The light source holding portion generates a rotational motion about a second axis; and a light sensor is disposed on one side of the light source holding portion.

In another embodiment, the present invention further provides a distributed photometric test apparatus, comprising: a light source holding portion; a first rotating portion coupled to the light source holding portion, the first rotating portion Providing a first rotational power to cause the light source holding portion to generate a rotational motion about a first axis; a second rotating portion coupled to the first rotating portion, the second rotating portion providing a second rotation The light source causes the light source holding portion to generate a rotational motion about a second axis; a light sensor disposed on one side of the light source holding portion; and an optical lens group attached to the light source holding portion and the optical The focus of the optical lens between the mirror sets produces a virtual image.

In order to enable the reviewing committee to have a further understanding and understanding of the features, objects and functions of the present invention, the related detailed structure of the device of the present invention and the concept of the design are explained below so that the reviewing committee can understand the present invention. The detailed description is as follows: The present invention provides a distributed photometric test device which utilizes two rotating mechanisms and a photo sensor to complete the measurement of the lamp in the C direction and the γ direction, thereby realizing the measurement of the light distribution curve. It not only simplifies the design of the mechanism, but also reduces the space required for the test site and reduces the time required for testing.

The invention provides a distributed photometric test device, which is arranged with an optical lens set between a light source to be tested and a light sensor, and the light source to be tested is placed at a distance of a multiple of the focal length (F) of the optical lens group, and is to be The light from the source will produce a virtual image at the focus (F) to form a point source, which reduces the space required for the test site.

Please refer to FIG. 2A and FIG. 2B, which are schematic diagrams of the first embodiment of the distributed photometric testing device of the present invention. The distributed photometric testing device 3 includes a light source holding portion 30, a first rotating portion 31, a second rotating portion 32, and a light sensor 33. The light source holding portion 30 provides a light source 90 to be tested. The light source to be tested 90 may be a light source formed by a light emitting diode or a cold cathode fluorescent tube, or an element that emits light such as a light bulb. There is no particular limitation on the shape of the light source to be tested 90. This embodiment is a planar light source. The mechanism for holding the light source can be implemented by suction, jaw or any mechanism that can hold the light source in the prior art, which is a technique well known to those skilled in the art and will not be described herein.

The first rotating portion 31 is coupled to the light source holding portion 30. The first rotating portion 31 is realized by a motor 310 reaching the angle sensing turret 311, which can provide a first rotational power to cause the light source holding portion to produce a first axis (C axis) Rotate the movement. The rotational motion is a 360-degree rotation to measure the direction of the light source 90 to be measured in the C-axis direction, and its rotational motion trajectory corresponds to the latitudinal direction of the earth. The second rotating portion 32 is coupled to the first rotating portion 31. The second rotating portion 32 provides a second rotational power to cause the light source holding portion 30 to generate a second axis (γ axis) direction. The rotational motion realizes the measurement of the light source 90 to be measured in the γ-axis direction, and its rotational motion trajectory corresponds to the warp direction of the earth. Similarly, the second rotating portion 32 is realized by a motor 320 that is coupled to the angle sensing 321 of the angle. The second axis (γ axis) in the present invention is the axis of the vertical horizontal plane (or the ground) 91. In this embodiment, the center of the second axis 322 is aligned with the light emitting surface of the light source to be tested 90. The first axis (C axis) is coaxial with the light emitting surface mechanical axis 901 of the light emitting surface 900 of the light source to be tested 90.

The light sensor 33 (such as an illuminometer) is placed on one side of the light source holding portion 30 to maintain a specific distance from the light source to be tested 90. In this embodiment, the photo sensor 33 has a height from the ground by the support of the support base 34. In order to make the light source 90 to be tested a point light source with respect to the light sensor 33, the distance between the light source 90 to be tested and the light sensor 33 is a position ten times longer than the size of the light source to be tested 90. Then, when the light source to be tested 90 emits light, the value read by the photo sensor 33 is matched with the rotational position data of the first rotating portion 31 and the second rotating portion 32, and is commonly connected to the electronic operation unit 35 that can perform the operation. (For example, a computer), the light intensity distribution value and the luminous flux value can be obtained by the formula that I=Er ² and the luminous flux are integrated solid angles of light intensity. Since the present embodiment is rotated at a high speed by the first rotating portion 31 and the second rotating portion 32, the measurement of the light source 90 to be measured in the C direction and the measurement time in the γ direction can be reduced.

Referring to FIG. 3A and FIG. 3B, the figure is a side view and a top view of a second embodiment of the distributed photometric testing device of the present invention. Since the light source 90 to be tested needs a relatively long distance from the photo sensor 33 in the first embodiment, the light generated by the light source 90 to be tested is reflected to the photo sensor by a reflective element 36 (for example, a mirror). 33. The photo sensor 33 is placed in a direction perpendicular to the illumination surface mechanical axis 901 of the light source 90 to be tested, that is, the direction of the sensing axis 330 of the photo sensor 33 is perpendicular to the first axis C. By the arrangement of the reflective element 36, the distance between the photo sensor 33 and the light source to be tested 90 is shortened. In addition, in the embodiment, a light barrier 37 is disposed between the light sensor 33 and the light source holding portion 30. The shutter 37 defines an opening 370, and the light sensor 33 is disposed at the opening. One side of the 370, and the other side of the opening 370 has the reflective element 36 at a position corresponding to the light source holding portion 90. The reflective element 36 reflects the light generated by the light source to be tested 90 to the photo sensor 33 via the opening 370. The baffle 37 can enhance the prevention of stray light entering the photo sensor 33 to increase the accuracy of the measurement. In addition, as shown in FIG. 3C, the figure is a schematic diagram of different configurations of the mirror and the photo sensor in the second embodiment of the present invention. The arrangement of FIG. 3C is different from the manner of FIG. 3A and FIG. 3B. The difference is that the photo sensor 33 is disposed under the light source narrowing portion 30, and the reflective element 36 is to be tested. Light from source 90 is reflected onto the photo sensor.

Please refer to FIG. 4A and FIG. 4B, which are schematic top and side views of a third embodiment of the distributed photometric testing device of the present invention. In this embodiment, the distributed photometric test device is substantially similar to the embodiment of FIG. 3A and FIG. 3B. The difference is that the embodiment has a first reflective component 380 and a second reflective component 381. The reflective surface of the first reflective element 380 corresponds to the reflective surface of the light source holding portion 30 and the second reflective element 381, and the reflective surface of the second reflective element 381 is coupled to the photo sensor 33 and the first The reflective surface of the reflective element 380 corresponds. The light generated by the light source 90 to be tested held by the light source holding portion 30 can be reflected to the second reflective element 381 via the first reflective element 380 and reflected to the light receiver 33 via the second reflective element 381. Similarly, in order to prevent stray light from entering the photo sensor, as shown in FIG. 4C, a baffle 39 is further disposed between the photo sensor 33 and the light source holding portion 30.

Referring to FIG. 5, the figure is a schematic diagram of a fourth embodiment of the distributed photometric testing device of the present invention. In the embodiment, an optical lens group 5 is disposed between the light sensor 33 and the light source to be tested 90, and the optical lens group 5 is disposed between the light source holding portion 30 and the optical lens group 5. Focus on creating a virtual image. In this embodiment, the optical lens assembly 5 can be a single concave lens or an optical lens group composed of at least one concave lens. As shown in Figure 6, the figure is a schematic diagram of the optical path. When the light source 90 to be measured is placed at a multiple of the focal length (F) of the optical lens group 5, its light will cause the virtual image to be focused on the focus (F). At this time, the light source to be tested 90 can be regarded as a point light source generated by the focus F. The value read by the photo sensor 33 is connected to the electronic operation unit together with the angle data of the first rotating portion and the second rotating portion, and the light intensity can be obtained by using the formula of I=Er ² and the luminous flux as the integrated solid angle of the light intensity. Distribution value and luminous flux value. It should be noted that although the optical lens assembly 5 shown in FIG. 5 is combined with the embodiment of FIG. 2A, it is not limited thereto, and the optical lens assembly 5 can also be in accordance with the second and third embodiments of the present invention. The examples are combined. By the virtual image focusing characteristic of the optical lens group, the distance between the light source to be tested and the light sensor can be shortened, and for a large-sized light source to be tested, it is a design that can reduce the distance and space required for detection.

Through the high-speed rotation of the first rotating portion and the second rotating portion, the measurement of the light source to be measured in the C direction and the measurement in the γ direction are performed, and the luminous flux with respect to the light source to be tested can be obtained within 10 minutes, compared with the conventional one. The light distribution curve takes 2 to 4 hours, or is 30 minutes to 1 hour in the far-reaching modified distribution photometer (US public number US. Pub. No. 20080304049), with a considerable degree of improvement.

However, the above is only an embodiment of the present invention, and the scope of the present invention is not limited thereto. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

100. . . Photometric test system

102. . . reflector

104. . . Lamp

106. . . Light sensor

108. . . Spindle

110. . . Lamp arm adjustment shaft

112. . . Light shaft

200. . . Mirror-type distribution photometer

204‧‧‧Lights

206‧‧‧Light sensor

208‧‧‧ray axis

210‧‧‧vertical axis

3‧‧‧Distribution photometric test device

30‧‧‧Light source maintenance department

31‧‧‧First rotation

32‧‧‧Second rotation

322‧‧‧second axis

33‧‧‧Light sensor

330‧‧‧Sensing axis

34‧‧‧ support

35‧‧‧Electronic Computing Unit

36‧‧‧reflecting elements

37‧‧‧Baffle

370‧‧‧ openings

380, 381‧‧‧reflecting elements

39‧‧‧Baffle

5‧‧‧Optical mirror

90‧‧‧Light source to be tested

900‧‧‧Lighting surface

901‧‧‧Lighting surface mechanical axis

Figure 1A and Figure 1B are schematic diagrams of conventional distributed photometric testing devices.

2A and 2B are schematic views showing a first embodiment of the distributed photometric test apparatus of the present invention.

FIG. 3A and FIG. 3B are schematic side and top plan views of a second embodiment of the distributed photometric testing device of the present invention.

FIG. 3C is a schematic diagram showing different configurations of the reflective element and the photo sensor in the second embodiment of the present invention.

4A and 4B are top and side views of a third embodiment of the distributed photometric testing device of the present invention.

Figure 4C is a schematic view showing the addition of a spacer for the third embodiment.

Please refer to FIG. 5 , which is a schematic diagram of a fourth embodiment of the distributed photometric testing device of the present invention.

Figure 6 is a schematic diagram of the optical path.

3. . . Distributed photometric test device

30. . . Light source holding unit

31. . . First turning part

32. . . Second rotating part

322. . . Second axis

33. . . Light sensor

34. . . Support base

35. . . Electronic computing unit

90. . . Light source to be tested

900. . . Luminous surface

901. . . Luminous surface mechanical axis

Claims (7)

A distributed photometric testing device includes: a light source holding portion; a first rotating portion coupled to the light source holding portion, the first rotating portion providing a first rotational power to the light source holding portion Generating a rotational motion about a first axis; a second rotating portion coupled to the first rotating portion, the second rotating portion providing a second rotational power to cause the light source holding portion to generate a second a rotational movement of the shaft; a light sensor disposed on one side of the light source holding portion; and an optical lens set at a focus of the optical lens group between the light source holding portion and the optical lens group To create a virtual image, wherein the optical lens assembly is an optical lens group including at least one concave lens. The distributed photometric test device of claim 1, further comprising a reflective element. The distributed photometric test device of claim 2, further comprising a baffle disposed between the photo sensor and the light source holding portion, the baffle having an opening, the light The sensor is disposed on one side of the opening, and the other side of the opening has the reflective element at a position corresponding to the light source holding portion, wherein the sensing axial direction of the photo sensor is coupled to the first axis vertical. The distributed photometric test device of claim 2, wherein the photo sensor is disposed on a lower side of the light source holding portion. For example, the distributed photometric test device described in claim 1 is Further having a first reflective element and a second reflective element, the reflective surface of the first reflective element is corresponding to the light source holding portion and the reflective surface of the second reflective element, and the reflective surface of the second reflective element is The light sensor and the reflective surface of the first reflective element correspond to each other, wherein the sensing axial direction of the light sensor is parallel to the first axis. The distributed photometric test device of claim 5, wherein the light sensor and the light source holding portion further have a baffle. The distributed photometric test apparatus of claim 1, wherein the first shaft is held by the light source holding portion and the light emitting surface mechanical axis of the light source to be tested is perpendicular to a horizontal plane.