JP2010243346A - Measurement device, measurement method, measurement program, and display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement device, measurement method, measurement program and display system which can be arranged in a small space, and can obtain sufficient measurement accuracy in temperature measurements of an optical member. <P>SOLUTION: The measurement device 200 includes, a contact sensor 210 for contacting the optical member, a stoppage detection unit 220 for detecting the stoppage of light irradiation to the optical member, and a temperature acquiring unit 230 for acquiring the temperature of the optical member. The contact sensor 210 detects the temperature of the part to which the contact sensor 210 makes contact with. The temperature acquiring unit 230 acquires the temperature of the optical member, based on the temperature detected by the contact sensor 210, after detecting the stoppage of light irradiation to the optical member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a measuring apparatus, a measuring method, a measuring program, and a display system for measuring the temperature of an optical member configured to be irradiated with light.

  A technique for measuring the temperature of an optical member configured to be irradiated with light, such as a lens or a light modulation element, is known.

  For example, a technique for measuring the temperature of an optical member using an infrared camera that measures infrared radiation emitted from the optical member has been proposed (for example, Patent Document 1).

  Since the infrared camera is not in contact with the optical member, the influence of the temperature increase of the infrared camera upon irradiation with light on the temperature of the optical member is small. Therefore, a technique using an infrared camera is common in measuring the temperature of the optical member.

JP-A-10-239213

  By the way, the emissivity of infrared rays from the optical member depends on the material and temperature of the optical member. Moreover, the emissivity of the infrared rays from the optical member depends on the angle (measurement angle) at which the infrared camera measures the infrared rays. Therefore, the method of using a non-contact type sensor such as an infrared camera has not been sufficient in temperature measurement accuracy of the optical member.

  In addition, in a device provided with an optical member (for example, a projection display device), it is conceivable that a space for arranging the infrared camera cannot be secured.

  Accordingly, the present invention has been made to solve the above-described problems, and can be arranged in a space-saving manner, and a measuring apparatus and a measuring method that can obtain sufficient measurement accuracy in measuring the temperature of an optical member An object of the present invention is to provide a measurement program and a display system.

  The measuring device (measuring device 200) according to the first feature measures the temperature of an optical member (for example, the liquid crystal panel 50) configured to be irradiated with light. The measurement apparatus includes a contact sensor (contact sensor 210) that contacts the optical member, a stop detection unit (detection stop unit 220) that detects stop of light irradiation to the optical member, and the temperature of the optical member. The acquisition part (temperature acquisition part 230) to acquire is provided. The contact sensor detects a temperature of a portion where the contact sensor contacts. The acquisition unit acquires the temperature of the optical member based on the temperature detected by the contact type sensor after detecting the stop of light irradiation to the optical member.

  In the first feature, the acquisition unit specifies a temperature change of the optical member and a temperature change of the contact-type sensor after detecting stop of light irradiation to the optical member. The acquisition unit calculates a temperature of the optical member based on a temperature change of the optical member and a temperature change of the contact sensor.

  1st characteristic WHEREIN: The said acquisition part calculates the temperature of the said optical member based on Y = y0 + A1 * exp (-B1 * x) + A2 * exp (-B2 * x). Y represents the total of the environmental temperature of the optical member, the rising temperature of the optical member with respect to the environmental temperature, and the rising temperature of the contact sensor with respect to the environmental temperature. Said x shows the time which passed since the irradiation stop of the light to the said optical member. The y0 represents the environmental temperature of the optical member. Said A1 is the temperature rise of the said contact-type sensor accompanying light irradiation to the said optical member. Said A2 is the temperature rise of the said optical member accompanying irradiation of the light to the said optical member. The exp (−B1 × x) indicates a rate at which the temperature of the contact sensor decreases after the stop of light irradiation on the optical member is detected. The exp (−B2 × x) indicates a rate at which the temperature of the optical member decreases after the stop of light irradiation to the optical member is detected. The A1 × exp (−B1 × x) represents a temperature decay function of the contact sensor. The A2 × exp (−B2 × x) represents a temperature attenuation function of the optical member. The temperature of the optical member while the optical member is irradiated with light is represented by y0 + A2.

  The measurement method according to the second feature is a method of measuring the temperature of an optical member configured to be irradiated with light. The measurement method includes a step A of detecting a temperature of a portion in contact with the contact type sensor by a contact type sensor in contact with the optical member, a step B of detecting stop of light irradiation to the optical member, and the optical After detecting the stop of light irradiation to the member, the method includes a step C of acquiring the temperature of the optical member based on the temperature detected in the step A.

  The measurement program according to the third feature is a program for measuring the temperature of an optical member configured to be irradiated with light. The measurement program includes a step A for detecting a temperature of a portion in contact with the contact-type sensor by a contact-type sensor in contact with the optical member, a step B for detecting stop of light irradiation to the optical member, and the optical After detecting the stop of light irradiation on the member, the computer is caused to execute Step C of acquiring the temperature of the optical member based on the temperature detected in Step A.

  A display system according to a fourth feature includes a display device (for example, a projection-type image display device 100) having an optical member configured to be irradiated with light, and a measurement device (measurement) that measures the temperature of the optical member. Device 200). The measurement apparatus includes a contact sensor that contacts the optical member, a stop detection unit that detects stop of light irradiation on the optical member, and an acquisition unit that acquires the temperature of the optical member. The contact sensor detects a temperature of a portion where the contact sensor contacts. The acquisition unit acquires the temperature of the optical member based on the temperature detected by the contact type sensor after detecting the stop of light irradiation to the optical member.

  According to the present invention, it is possible to provide a measurement device, a measurement method, a measurement program, and a display system that can be arranged in a space-saving manner and can obtain sufficient measurement accuracy in temperature measurement of an optical member.

1 is a diagram showing a projection display apparatus 100 according to a first embodiment. It is a block diagram which shows the measuring apparatus 200 which concerns on 1st Embodiment. It is a figure showing contact type sensor 210 concerning a 1st embodiment. It is a figure for demonstrating fitting of the attenuation function which concerns on 1st Embodiment. It is a figure for demonstrating fitting of the attenuation function which concerns on 1st Embodiment. It is a figure for demonstrating fitting of the attenuation function which concerns on 1st Embodiment. It is a figure for demonstrating fitting of the attenuation function which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the measuring apparatus 200 which concerns on 1st Embodiment.

  Hereinafter, a measurement apparatus, a measurement method, a measurement program, and a display system according to embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
The measuring device according to the embodiment measures the temperature of an optical member configured to be irradiated with light. The measurement apparatus includes a contact-type sensor that comes into contact with the optical member, a stop detection unit that detects a stop of light irradiation on the optical member, and an acquisition unit that acquires the temperature of the optical member. The contact-type sensor detects the temperature of the part where the contact-type sensor comes into contact. The acquisition unit acquires the temperature of the optical member based on the temperature detected by the contact sensor after detecting the stop of light irradiation to the optical member.

  The measurement method according to the embodiment is a method of measuring the temperature of an optical member configured to be irradiated with light. The measurement method includes a step A of detecting a temperature of a portion in contact with the contact sensor by a contact sensor in contact with the optical member, a step B of detecting stop of light irradiation to the optical member, and a light to the optical member. After detecting the stop of irradiation, a step C for obtaining the temperature of the optical member based on the temperature detected in the step A is provided.

  The measurement program according to the embodiment causes the computer to execute Step A, Step B, and Step C described above. The display system according to the embodiment includes a display device having an optical member configured to be irradiated with light in addition to the measurement device described above.

  In the embodiment, since the temperature of the portion that contacts the contact sensor is detected by the contact sensor that contacts the optical member, there are few restrictions on the measurement angle and the arrangement space as in the case of a non-contact sensor such as an infrared camera. . In addition, since the temperature of the optical member is acquired based on the temperature detected by the contact type sensor after the stop of the light irradiation to the optical member is detected, the contact accompanying the light irradiation to the contact type sensor. The influence of the temperature rise of the mold sensor can be eliminated. Therefore, sufficient measurement accuracy can be obtained in the temperature measurement of the optical member.

  In the embodiment, a projection display apparatus is exemplified as the display apparatus. That is, the display system includes a projection display apparatus and a measurement apparatus. However, the projection display apparatus is an example of a display apparatus, and it is needless to say that the display apparatus is not limited to the projection display apparatus.

[First Embodiment]
(Configuration of projection display device)
Hereinafter, the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 100 includes a projection optical unit 110 and an illumination unit 120.

  The projection optical unit 110 projects the image light emitted from the illumination unit 120 onto a screen (not shown).

  First, the illumination unit 120 includes a white light source 10, a UV / IR cut filter 20, a fly-eye lens unit 30, a PBS array 40, and a plurality of liquid crystal panels 50 (a liquid crystal panel 50R, a liquid crystal panel 50G, and a liquid crystal panel). 50B) and a cross dichroic prism 60.

  The white light source 10 is a light source that emits white light (for example, a UHP lamp or a xenon lamp). That is, the white light emitted from the white light source 10 includes red component light R, green component light G, and blue component light B.

  The UV / IR cut filter 20 transmits visible light components (red component light R, green component light G, and blue component light B). The UV / IR cut filter 20 shields infrared light components and ultraviolet light components.

  The fly-eye lens unit 30 makes the light emitted from the white light source 10 uniform. Specifically, the fly eye lens unit 30 includes a fly eye lens 30a and a fly eye lens 30b. The fly-eye lens 30a and the fly-eye lens 30b are each composed of a plurality of minute lenses. Each microlens condenses the light emitted from the white light source 10 so that the light emitted from the white light source 10 is irradiated on the entire surface of the liquid crystal panel 50.

  The PBS array 40 aligns the polarization state of the light emitted from the fly-eye lens unit 30. For example, the PBS array 40 aligns the light emitted from the fly-eye lens unit 30 with S-polarized light (or P-polarized light).

The liquid crystal panel 50R modulates red component light R on the basis of the red output signal _{R out.} An incident-side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light is incident on the liquid crystal panel 50R. 52R is provided. On the side from which light is emitted from the liquid crystal panel 50R, the exit-side polarizing plate that blocks light having one polarization direction (for example, S-polarized light) and transmits light having another polarization direction (for example, P-polarized light). 53R is provided.

The liquid crystal panel 50G modulates the green component light G based on the green output signal _Gout . An incident-side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light enters the liquid crystal panel 50G. 52G is provided. On the other hand, on the side where the light is emitted from the liquid crystal panel 50G, light having one polarization direction (for example, S-polarized light) is shielded and light having another polarization direction (for example, P-polarized light) is transmitted. A side polarizing plate 53G is provided.

The liquid crystal panel 50B modulates blue component light B, based on the blue output signal _{B out.} An incident side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light is incident on the liquid crystal panel 50B. 52B is provided. On the other hand, on the side from which light is emitted from the liquid crystal panel 50B, light having one polarization direction (for example, S-polarized light) is shielded and light having another polarization direction (for example, P-polarized light) is transmitted. A side polarizing plate 53B is provided.

The red output signal _Rout , the green output signal _Gout, and the blue output signal _Bout constitute a video output signal. The video output signal is a signal for each of a plurality of pixels constituting one frame.

  Here, each liquid crystal panel 50 may be provided with a compensation plate (not shown) for improving the contrast ratio and the transmittance. Each polarizing plate may have a pre-polarizing plate that reduces the amount of light incident on the polarizing plate and the thermal burden.

  The cross dichroic prism 60 constitutes a color combining unit that combines light emitted from the liquid crystal panel 50R, the liquid crystal panel 50G, and the liquid crystal panel 50B. The combined light emitted from the cross dichroic prism 60 is guided to the projection optical unit 110.

  Secondly, the illumination unit 120 includes a mirror group (mirrors 71 to 76) and a lens group (lenses 81 to 85).

  The mirror 71 is a dichroic mirror that transmits the blue component light B and reflects the red component light R and the green component light G. The mirror 72 is a dichroic mirror that transmits the red component light R and reflects the green component light G. The mirror 71 and the mirror 72 constitute a color separation unit that separates the red component light R, the green component light G, and the blue component light B.

  The mirror 73 reflects the red component light R, the green component light G, and the blue component light B, and guides the red component light R, the green component light G, and the blue component light B to the mirror 71 side. The mirror 74 reflects the blue component light B and guides the blue component light B to the liquid crystal panel 50B side. The mirror 75 and the mirror 76 reflect the red component light R and guide the red component light R to the liquid crystal panel 50R side.

  The lens 81 is a condenser lens that collects the light emitted from the PBS array 40. The lens 82 is a condenser lens that collects the light reflected by the mirror 73.

  The lens 83R collimates the red component light R so that the liquid crystal panel 50R is irradiated with the red component light R. The lens 83G collimates the green component light G so that the liquid crystal panel 50G is irradiated with the green component light G. The lens 83B collimates the blue component light B so that the liquid crystal panel 50B is irradiated with the blue component light B.

  The lens 84 and the lens 85 are relay lenses that substantially image the red component light R on the liquid crystal panel 50R while suppressing the expansion of the red component light R.

(Configuration of measuring device)
Hereinafter, the measuring apparatus according to the first embodiment will be described with reference to the drawings. FIG. 2 is a block diagram showing the measuring apparatus 200 according to the first embodiment.

  As shown in FIG. 2, the measuring apparatus 200 includes a contact sensor 210, a detection stop unit 220, and a temperature acquisition unit 230.

  The contact sensor 210 is disposed so as to contact an optical member provided in the projection display apparatus 100. The contact-type sensor 210 detects the temperature of the part where the contact-type sensor 210 comes into contact.

  Here, a case where the contact sensor 210 is a thermocouple and the optical member is the liquid crystal panel 50 is illustrated. As shown in FIG. 3, the contact sensor 210 is fixed to the liquid crystal panel 50 with an aluminum tape 211. The contact-type sensor 210 and the aluminum tape 211 generate heat due to light irradiation on the contact-type sensor 210 and the aluminum tape 211. Therefore, it should be noted that the temperature detected by the contact sensor 210 is affected by the heat generated by the contact sensor 210 and the aluminum tape 211.

  In addition, the optical member should just be comprised so that light may be irradiated. Therefore, the optical member is not limited to the light modulation element such as the liquid crystal panel 50, and may be various mirrors or various lenses.

  The detection stop unit 220 detects the stop of light irradiation on the optical member. That is, the detection stop unit 220 detects the stop of light emission from the white light source 10.

  (1) The detection stop unit 220 may be configured to detect power-off of the projection display apparatus 100. The power supply of the projection display apparatus 100 is manually turned off by the user, for example.

  (2) The detection stop unit 220 may be configured to monitor the power supplied to the white light source 10 and detect the power OFF supplied to the white light source 10.

  (3) The detection stop unit 220 may be configured to detect the stop of the emission of light from the white light source 10 based on the detection result of the light amount sensor that detects the amount of light emitted from the white light source 10.

  The temperature acquisition unit 230 acquires the temperature of the optical member. Specifically, the temperature acquisition unit 230 specifies the temperature change of the optical member and the temperature change of the contact sensor 210 (and the aluminum tape 211) after detecting the stop of light irradiation to the optical member. Subsequently, the temperature acquisition unit 230 calculates the temperature of the optical member based on the temperature change of the optical member and the temperature change of the contact sensor 210 (and the aluminum tape 211).

  For example, the temperature acquisition unit 230 calculates the temperature of the optical member while the optical member is irradiated with light according to the following equation.

  Here, the attenuation functions (A1 × exp (−B1 × x) and A2 × exp (−B2 × x)) are detected over a predetermined fitting time after the stop of light irradiation to the optical member is detected. The temperature (Y) detected by the contact sensor 210 is fitted. The predetermined fitting time is, for example, about 1 minute to 1 minute 30 seconds after the stop of the irradiation of light to the optical member is detected.

(Damping function fitting)
Hereinafter, the fitting of the attenuation function according to the first embodiment will be described with reference to the drawings. 4 to 7 are diagrams for explaining the fitting of the attenuation function according to the first embodiment. 4 to 7, the vertical axis represents temperature and the horizontal axis represents time.

  First, the temperature (Y) detected by the contact sensor 210 will be described with reference to FIGS. The solid line shown in FIG. 4 and FIG. 5 shows a curve (hereinafter referred to as a detected temperature curve) indicating a change in temperature (Y) detected by the contact sensor 210. As shown in FIGS. 4 and 5, the temperature (Y) detected by the contact sensor 210 gradually increases after the start of light irradiation on the optical member. In addition, after the irradiation of light to the optical member is stopped, the temperature (Y) detected by the contact sensor 210 rapidly decreases and then gradually decreases. Thus, after the light irradiation to the optical member is stopped, the detected temperature curve includes the steep slope portion A and the gentle slope portion B. Here, it should be noted that the detected temperature curve is shifted in the vertical axis direction by the environmental temperature.

  Here, the heat dissipation characteristics of the contact sensor 210 and the aluminum tape 211 are better than the heat dissipation characteristics of the optical member. That is, after the light irradiation to the optical member is stopped, the temperature of the contact sensor 210 and the aluminum tape 211 is likely to be lower than the temperature of the optical member.

  From this point of view, the steep portion A described above is similar to a curve indicating a temperature drop of the contact sensor 210 and the aluminum tape 211. Similarly, the above-described gentle gradient portion B is similar to a curve indicating a temperature drop of the optical member.

  Second, the fitting of the temperature attenuation function of the contact sensor 210 and the temperature attenuation function of the optical member will be described with reference to FIG. A dotted line shown in FIG. 6 indicates a curve indicating a temperature drop of the contact sensor 210 (a temperature attenuation function of the contact sensor 210). The dashed-dotted line shown in FIG. 6 has shown the curve (the attenuation function of the temperature of an optical member) which shows the temperature fall of an optical member. Here, it should be noted that the curve indicating the temperature drop of the optical member is shifted in the vertical axis direction by the environmental temperature. In addition, the continuous line shown in FIG. 6 has shown the detected temperature curve similarly to FIG.4 and FIG.5.

  As shown in FIG. 6, the attenuation function (A2 × exp (−B2 × x)) of the temperature of the optical member is fitted to the gentle gradient portion B. Thereby, the parameter (for example, A2) mentioned above is specified.

  Similarly, after the irradiation of light to the optical member is stopped, the sum of the attenuation function of the temperature of the optical member (A2 × exp (−B2 × x)) and the attenuation function of the temperature of the contact sensor 210 is set to the steep slope portion A. Fit. Thereby, the above-described parameter (for example, A1) is specified.

  Third, the calculation of the temperature of the optical member will be described with reference to FIG. The dashed-dotted line shown in FIG. 7 has shown the curve (the attenuation function of the temperature of an optical member) which shows the temperature fall of an optical member. In addition, the continuous line shown in FIG. 7 has shown the detected temperature curve similarly to FIG.4 and FIG.5.

  As shown in FIG. 7, the temperature (T) of the optical member while the optical member is irradiated with light is determined by the intersection point P between the vertical axis at the time when the irradiation of light to the optical member is stopped and the temperature attenuation function of the optical member. ) Is calculated. That is, by substituting “x = 0” into A2 × exp (−B2 × x), the temperature rise (A2) of the optical member accompanying the light irradiation to the optical member is calculated.

  The temperature (T) of the optical member is a value obtained by adding the rising temperature (A2) of the optical member to the environmental temperature (y0) of the optical member. That is, the temperature (T) of the optical member is represented by y0 + A2 as described above.

(Operation of measuring device)
Hereinafter, the operation of the measuring apparatus according to the first embodiment will be described with reference to the drawings. FIG. 8 is a flowchart showing the operation of the measuring apparatus 200 according to the first embodiment.

  As shown in FIG. 8, in step 10, initial setting is performed. For example, in the initial setting, the contact sensor 210 is attached to the optical member, and the projection display apparatus 100 is turned on.

  In step 20, the measuring apparatus 200 detects the temperature of the part in contact with the contact sensor 210 by the contact sensor 210 in contact with the optical member.

  In step 30, the measuring apparatus 200 detects the stop of light irradiation on the optical member. The stop of irradiation of light to the optical member is detected by, for example, one of the following methods.

(1) Detection of power-off of the projection display apparatus 100 (2) Detection of power OFF supplied to the white light source 10 (3) Detection of stoppage of light emission from the white light source 10 based on the detection result of the light quantity sensor

  In step 40, the measuring apparatus 200 determines the steep slope portion A and the gentle slope based on a curve (detected temperature curve) indicating a change in temperature detected by the contact sensor 210 after the light irradiation to the optical member is stopped. Part B is specified. Subsequently, the measuring apparatus 200 fits the attenuation function of the temperature of the optical member with the gentle gradient portion B. Further, the measuring apparatus 200 fits the sum of the attenuation function of the temperature of the optical member (A2 × exp (−B2 × x)) and the temperature attenuation function of the contact sensor 210 with the steep slope portion A. Subsequently, the measuring apparatus 200 specifies various parameters (for example, A1 and A2) by fitting an attenuation function.

  In step 50, the measuring apparatus 200 acquires the temperature of the optical member. Specifically, the measuring apparatus 200 calculates the temperature (T) of the optical member by adding the rising temperature (A2) of the optical member to the environmental temperature (y0) of the optical member.

(Function and effect)
In the first embodiment, since the temperature of the part in contact with the contact sensor 210 is detected by the contact sensor 210 in contact with the optical member, the measurement angle and the arrangement space are different from those of a non-contact sensor such as an infrared camera. There are few restrictions. Further, since the temperature of the optical member is acquired based on the temperature detected by the contact sensor 210 after the stop of the light irradiation to the optical member is detected, the light is applied to the contact sensor. The influence of the temperature rise of the contact sensor 210 can be removed. Therefore, sufficient measurement accuracy can be obtained in the temperature measurement of the optical member.

  Specifically, first, after the light irradiation to the optical member is stopped, the steep slope portion A and the gentle slope are based on a curve (detected temperature curve) indicating a change in temperature detected by the contact sensor 210. Part B is identified. Second, the temperature decay function of the optical member is fitted with the gentle slope portion B, and the sum of the temperature decay function of the optical member (A2 × exp (−B2 × x)) and the temperature decay function of the contact sensor 210 is obtained. Is fitted to the steep part A. Third, the temperature (T) of the optical member is calculated by adding the rising temperature (A2) of the optical member to the environmental temperature (y0) of the optical member. Thus, since the influence of the temperature rise of the contact sensor 210 is removed, sufficient measurement accuracy can be obtained in the temperature measurement of the optical member.

  In other words, in the embodiment, paying attention to the difference between the heat radiation characteristics of the contact sensor 210 and the heat radiation characteristics of the optical member, after the light irradiation to the optical member is stopped, the subtraction function of the optical member is fitted to the gentle gradient portion B. By doing so, the influence of the temperature rise of the contact sensor 210 is removed.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Although not specifically mentioned in the above-described embodiment, fitting of the attenuation function may be performed manually by the user. In such a case, the measuring apparatus 200 displays the images shown in FIGS. The user performs the attenuation function fitting while viewing the image displayed by the measuring apparatus 200.

  In the embodiment described above, the contact sensor 210 is attached to the optical member by the aluminum tape 211. However, the embodiment is not limited to this. The thermocouple provided in the contact sensor 210 may be configured in a clip shape, and the contact sensor 210 may be attached to the optical member by sandwiching the optical member with the thermocouple. Of course, the aluminum tape 211 is unnecessary in such a case.

  In the above-described embodiment, the case where the measuring apparatus 200 measures the temperature of the optical member irradiated with visible light (red component light R, green component light G, or blue component light B) is exemplified. However, the embodiment is not limited to this. Specifically, in addition to visible light, the optical member may be irradiated with light including ultraviolet light and infrared light. In addition, the measuring device 200 may measure the temperature of the optical member irradiated with the energy of electromagnetic waves in a specific wavelength band. However, it should be noted that the absorption rate of the irradiation electromagnetic wave in the tip of the thermocouple or the aluminum tape is higher than the absorption rate of the irradiation electromagnetic wave in the optical member. It should be noted that the wavelength band in which the temperature of the optical member increases due to the irradiation of electromagnetic waves is longer than the radio wave (infrared light, visible light, ultraviolet light, X-rays, gamma rays).

  Although not particularly mentioned in the above-described embodiment, it is effective to use the measuring device 200 for measuring the temperature of an optical member having an extremely low radiation energy absorption rate.

  In the above-described embodiment, the case of measuring the temperature of the liquid crystal panel 50 as an optical member has been illustrated. However, the optical member is not limited to this. In addition to cases where the space for placing an infrared camera cannot be secured, optical members with extremely high transmittance or reflectance, half mirrors with a predetermined transmittance or reflectance, polarizing beam splitters, dichroic mirrors, polarizing plates, color filters, etc. The above-described embodiments are also useful for optical members.

  DESCRIPTION OF SYMBOLS 10 ... White light source, 20 ... UV / IR cut filter, 30 ... Fly eye lens unit, 40 ... PBS array, 50 ... Liquid crystal panel, 52, 53 ... Polarizing plate, 60 ... Cross dichroic cube, 71-76 ... Mirror, 81-85 ... Lens, 100 ... Projection display device, 200 ... Measurement device, 210 ... Contact sensor, 211 ..Aluminum tape, 220 ... detection stop unit, 230 ... temperature acquisition unit

Claims (6)

A measuring device for measuring the temperature of an optical member configured to be irradiated with light,
A contact sensor in contact with the optical member;
A stop detection unit for detecting stop of light irradiation to the optical member;
An acquisition unit for acquiring the temperature of the optical member,
The contact sensor detects the temperature of the part that the contact sensor contacts,
The acquisition unit acquires the temperature of the optical member based on the temperature detected by the contact-type sensor after detecting the stop of light irradiation to the optical member. The acquisition unit specifies a temperature change of the optical member and a temperature change of the contact sensor after detecting the stop of light irradiation to the optical member,
The measurement apparatus according to claim 1, wherein the acquisition unit calculates a temperature of the optical member based on a temperature change of the optical member and a temperature change of the contact sensor. The acquisition unit calculates the temperature of the optical member based on Y = y0 + A1 × exp (−B1 × x) + A2 × exp (−B2 × x),
Y represents the total of the environmental temperature of the optical member, the rising temperature of the optical member relative to the environmental temperature, and the rising temperature of the contact sensor relative to the environmental temperature;
X represents a time elapsed from the stop of light irradiation to the optical member;
Y0 represents the environmental temperature of the optical member;
A1 is the temperature rise of the contact sensor accompanying the irradiation of light to the optical member,
A2 is the temperature rise of the optical member accompanying the irradiation of light to the optical member,
The exp (−B1 × x) indicates a rate at which the temperature of the contact sensor decreases after the stop of light irradiation to the optical member is detected,
The exp (−B2 × x) indicates the rate at which the temperature of the optical member decreases after the stop of irradiation of light to the optical member is detected,
The A1 × exp (−B1 × x) represents a temperature attenuation function of the contact sensor,
The A2 × exp (−B2 × x) represents a temperature attenuation function of the optical member,
The measuring apparatus according to claim 2, wherein the temperature of the optical member while the optical member is irradiated with light is represented by y0 + A2. A measurement method for measuring the temperature of an optical member configured to be irradiated with light,
Detecting a temperature of a portion in contact with the contact sensor by a contact sensor in contact with the optical member; and
Detecting a stop of light irradiation to the optical member;
A measurement method comprising: a step C of acquiring the temperature of the optical member based on the temperature detected in the step A after detecting the stop of the light irradiation to the optical member. A measurement program for measuring the temperature of an optical member configured to be irradiated with light, the computer comprising:
Detecting a temperature of a portion in contact with the contact sensor by a contact sensor in contact with the optical member; and
Detecting a stop of light irradiation to the optical member;
A measurement program for executing the step C of acquiring the temperature of the optical member based on the temperature detected in the step A after detecting the stop of light irradiation to the optical member. A display system comprising a display device having an optical member configured to be irradiated with light, and a measuring device for measuring the temperature of the optical member,
The measuring device is
A contact sensor in contact with the optical member;
A stop detection unit for detecting stop of light irradiation to the optical member;
An acquisition unit for acquiring the temperature of the optical member;
The contact sensor detects the temperature of the part that the contact sensor contacts,
The said acquisition part acquires the temperature of the said optical member based on the temperature detected by the said contact-type sensor, after the irradiation stop of the light to the said optical member is detected.

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