JP4411044B2 - Spectral distribution control method for projector projection light - Google Patents

Description

  The present invention relates to a spectral distribution control method for projector projection light, and particularly in the case where the luminous intensity of a spectral component in a specific wavelength band in the spectrum of light projected from a projector is insufficient compared to the luminous intensity of spectral components in other bands. The present invention relates to a spectral distribution control method for projector projection light.

  In a conventional portable projector, as disclosed in Japanese Patent Application Laid-Open No. 2002-296680, a lamp used as a light source of a projector has a characteristic of a spectral component of light in a specific wavelength band of light projected from the lamp. Insufficient luminous intensity is a problem, and in order to obtain a balance between the luminous intensity of the spectral component in that wavelength band and the luminous intensity of the spectral component in the other wavelength band, the spectral component of the specific wavelength band where the luminous intensity is insufficient. In order to supplement the luminous intensity, other light sources capable of emitting and projecting the same light as the spectral components thereof, for example, solid state light sources such as LEDs are used as the light source together with the lamp, and light in a specific wavelength band of the lamp as the main light source The projector is configured to compensate for the lack of luminous intensity of the spectral components.

  As described above, the projector 16 shown in FIG. 3 emits the same light as the spectral component in the wavelength band of the red light because the intensity of the spectral component of the red light is insufficient only with the projection light from the lamp 10 as the main light source. The wavelength of the red light projected from the lamp 10 by the red light projected from the solid light source 1b by providing the solid light source 1b using a red LED (Light Emitting Diode) as a secondary light source in the vicinity of the lamp 10 as the main light source. It is configured to compensate for the lack of luminous intensity of the optical spectrum component in the band.

  Further, as shown in FIG. 4, the solid light source unit 1b uses a red LED that emits red as a solid light source, one end of the red LED is connected to a DC power source, and the other end is preset to a red LED. A current supply circuit is used in which a resistor having a resistance value that allows the current to flow is connected, and the other end of the resistor is connected to a ground potential.

  Referring to FIG. 3, the projector 16 shown in FIG. 3 projects the projection light from the lamp 10 as the main light source and the projection light from the solid light source unit 1 b as the sub light source onto the rod 12 via the color wheel 11. Further, the projection light from the lamp 10 that has passed through the rod 12 and the projection light from the solid-state light source unit 1 b are projected onto a DMD (Digital Micromirror Device) 13, and image information to be projected onto the screen 15 is read from the DMD 13. The projection light 25 is projected onto the screen 15 through the projection lens 14.

  However, in the conventional projector 16 provided with the sub-light source as described above, at the initial stage of use in which the new lamp 10 is attached to the main light source, there is a problem of insufficient light intensity of the optical spectrum component in the wavelength band of red light. The projector is used in the absence of light, but as the projector 16 is used more frequently and the cumulative lighting time of the lamp is increased, the luminous intensity of the projection light from the lamp 10 as the main light source is shown in FIG. The light intensity of the spectral component of the red light projected from the lamp 10 of the main light source also decreases in the same manner as the light intensity of the spectral components in other wavelength bands. Since the red light projected from the red LED 1b does not cause a decrease in luminous intensity due to the passage of the usage time of the red LED, the projector 16 is used. Accordingly, as the cumulative lighting time of the lamp 10 increases, the luminous intensity of the spectral component of the red light wavelength band of the projection light from the projector 16 becomes relatively higher than the luminous intensity of the spectral component of the other wavelength bands. There has been a problem that the balance of luminous intensity between spectral components in the band is lost.

JP 2002-296680 A (2nd page to 3rd page, FIG. 1)

  In the conventional projector described above, when the lamp of the main light source has just been replaced with a new lamp, that is, when the lamp has just started to be used, the spectral component of the above-mentioned specific wavelength band of the light projected from the projector The luminous intensity of the spectral component in the wavelength band of red light in the case of the projector shown in FIG. 3 has the same luminous intensity as the spectral components of the other wavelength bands, and there is no problem of insufficient luminous intensity. Is a state where the light intensity of the spectral components of each wavelength band is balanced, but as the lighting time of the main light source lamp increases, the light intensity of the projection light from the main light source lamp gradually decreases, On the other hand, the red light projected from the red LED of the sub-light source does not have a decrease in luminous intensity due to the passage of time of use. As the light intensity increases, the intensity of the spectral component in the specific wavelength band included in the projection light from the projector is unbalanced with the intensity of the spectral component in the other wavelength band, and the luminous intensity of the spectral component in the specific wavelength band is reduced. However, it has a drawback that it is relatively higher than the luminous intensity of the spectral components in other wavelength bands.

  The object of the present invention is to set the luminous intensity of the light projected from the sub-light source to a predetermined luminous intensity in response to the change in luminous intensity of the projected light of the main light source lamp that decreases as the cumulative lighting time of the main light source lamp increases. It is an object of the present invention to provide a spectral distribution control method for projector projection light that can be reduced and can maintain the balance of luminous intensity between spectral components in each wavelength band included in the projector projection light.

The spectrum distribution control method in the projector projection light of the first invention is:
(A) a lamp that is a main light source of the projector;
(B) Of the spectral components contained in the light of the lamp, used as a sub-light source of the projector to supplement the luminous intensity of spectral components in a specific wavelength band having a lower luminous intensity than other spectral components, A solid-state light source that emits light in a specific wavelength band,
In the spectrum distribution control system for projector projection light comprising: a value of the cumulative lighting time of the lamp is stored every time the projector is used, and a value of the cumulative lighting time of the lamp reaches a predetermined value A lamp lighting time management means for outputting a signal notifying that the value of the cumulative lighting time of the lamp has reached a predetermined value, and each time the signal from the lamp lighting time management means is received, the solid state light source Control means for controlling the current value supplied to the solid-state light source in order to reduce the luminous intensity of the spectral component of the specific wavelength band emitted from the light source to a predetermined luminous intensity lower than the luminous intensity at that time; It is characterized by having.

  The spectral distribution control method for projector projection light according to the second invention is the spectral distribution control method for projector projection light according to the first invention, wherein the lamp as the main light source emits light close to white light, The spectral component in the wavelength band is red light.

Further, the spectrum distribution control system in the projector projection light of the third invention is:
(A) a lamp that emits light close to white light, which is a main light source of the projector,
(B) a solid-state light source that emits red light, which is used as a sub-light source of the projector to supplement red light having a low luminous intensity compared to other spectral components among spectral components contained in the lamp light;
In the spectral distribution control method in the projector projection light equipped with
(C) A lamp that stores a cumulative lighting time value of the lamp every time the projector is used, and outputs a cumulative lamp lighting time signal every time the cumulative lighting time value of the lamp reaches a predetermined value. Lighting time management department,
(D) a control unit that outputs a red light intensity reduction control signal for switching the value of the current supplied to the solid state light source based on the input lamp lighting cumulative time signal;
(E) a supply current switching unit having a switching circuit for switching the value of the current supplied to the solid state light source;
(F) Each time the red light intensity reduction control signal is input, control is performed to reduce the intensity of the red light emitted from the solid light source to a predetermined value that is lower than the intensity at that time. In order to do so, the current value supplied to the solid-state light source is previously indicated in the red light intensity reduction control signal corresponding to the value of the cumulative lighting time of the lamp indicated by the lamp lighting cumulative time signal from the current value so far. A supply current switching control unit for outputting a switching circuit control instruction signal for instructing control of a switching circuit of the supply current switching unit, which is necessary for reducing the current value supplied to the solid-state light source to a predetermined value;
It is characterized by having.

  The spectrum distribution control method for projector projection light according to a fourth aspect of the invention is the spectrum distribution control method for projector projection light according to the third aspect of the invention, wherein the control unit replaces the lamp with a new lamp and stores lamp replacement information. When an operation is input, the lamp lighting time management unit stores the value of the cumulative lighting time stored in the lamp, and restarts the storage of the value of the cumulative lighting time of the new lamp. The

  Further, the spectrum distribution control method for projector projection light according to a fifth aspect of the invention is the spectrum distribution control method for projector projection light according to the third aspect of the invention, wherein the control unit receives the accumulated lamp lighting time signal during use of the projector. When output from the lamp lighting time management unit, the switching circuit control instruction signal is not output to the supply current switching control unit during use of the projector, and the lamp lighting cumulative time is not transmitted to the lamp lighting time management unit. The content indicated by the lamp lighting accumulated time signal stored in the lamp lighting time management unit when the use of the projector is started again after the use of the projector is ended after the content indicated by the signal is stored and held. The lamp lighting cumulative time signal is re-output based on the above, and the lamp lighting cumulative time signal is re-output. Configured as being to output the switching circuit control command signal to supply current switching control unit based.

  According to a sixth aspect of the present invention, there is provided a spectral distribution control method for projector projection light, which is the spectral distribution control method for projector projection light according to the third aspect of the present invention, further comprising a photometer for measuring the luminous intensity during use of the lamp. The determined value is a value calculated based on the luminous intensity of the lamp measured by the photometric device at the start of use of the projector.

  As described above, the spectral distribution control method for projector projection light according to the present invention stores the cumulative lighting time of the main light source lamp every time the projector is used, and sets the cumulative lighting time of the lamp to a predetermined value. Each time it reaches the light source, it is supplied to the sub-light source so that the light intensity of the specific wavelength band emitted and projected from the sub-light source can be lowered to a predetermined value lower than the light intensity at that time. In response to the change in the luminous intensity of the projection light of the main light source lamp, which decreases as the cumulative lighting time of the main light source lamp increases, The luminous intensity can be lowered to a predetermined luminous intensity, and the balance of luminous intensity between the spectral components of each wavelength band included in the projector projection light can be maintained. It has the effect that the kill.

  Every time the projector is used, the cumulative lighting time value of the lamp of the main light source is stored and managed, and the light projected from the lamp of the main light source every time the cumulative lighting time of the lamp reaches a predetermined value Spectral components in a specific wavelength band projected from the solid-state light source part of the secondary light source to supplement the luminous intensity of the spectrum in the specific wavelength band where the luminous intensity is insufficient compared to other spectral components By controlling the current supplied to the solid-state light source unit, the luminous intensity is reduced to a luminous intensity of a predetermined value lower than the luminous intensity at that time, and the spectral components of each wavelength band included in the projector projection light Do not break the balance of luminous intensity.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an embodiment of a spectrum distribution control system for projector projection light according to the present invention.

  The spectral distribution control method for projector projection light according to the present embodiment shown in FIG. 1 is a solid-state light source that uses an LED that emits red light and is connected to a DC power source and used as a sub-light source of the projector. The value of the current supplied to the solid-state light source is connected to a solid-state light source and the other end is connected to a switch 6a to switch 6d, which will be described later. When the projector is used, the solid-state light source unit 1a having resistors 7a to 7d having different resistance values is counted each time the lighting time of a lamp (not shown) of the main light source is counted. The lighting time is memorized from the start of the use of a new lamp to the last use of the projector when the projector is no longer used. A new cumulative lighting time value obtained by adding to the cumulative lamp lighting time value is stored, and every time the cumulative lighting time value of this lamp reaches a predetermined value, a lamp lighting cumulative time signal is stored. The lamp lighting time management unit 2 that outputs 27 and the lamp lighting cumulative time signal 27 output from the lamp lighting time management unit 2 are input, and the current supplied to the solid state light source based on the lamp lighting cumulative time signal 27 is input. A control unit 5 that outputs a red light intensity reduction control signal 28 for switching the value to a supply current switching control unit 3 to be described later, and a plurality of selector switches 6a to 6 for switching the value of the current supplied to the solid state light source When the supply current switching unit 4 having 6d and the red light intensity decrease control signal 28 are input, the intensity of the red light emitted from the solid state light source is set to be lower than the intensity at that time. In order to perform control to reduce the luminous intensity to a predetermined value, the current value supplied to the solid-state light source is red corresponding to the value of the cumulative lighting time of the lamp indicated by the lamp lighting cumulative time signal 27 from the current value so far. Instructs the control of the changeover switch of the supply current switching unit 4 required to reduce the current value supplied to the solid state light source of the solid state light source unit 1a to a predetermined value indicated by the light intensity reduction control signal 28. It is comprised from the supply current switching control part 3 which outputs the switching circuit control instruction signals 29a-29d.

  Next, the operation will be described.

  Referring to FIG. 1, the solid-state light source unit 1 a has one end connected to a DC power source and the other end connected to the supply current switching unit 4. The solid light source of the solid light source unit 1a is provided in the vicinity of a lamp (not shown) which is the main light source of the projector of the present invention, similarly to the solid light source of the solid light source unit 1b of the projector shown in FIG. Used as a secondary light source.

  That is, a lamp that emits light that is close to white light is used as the lamp. Among the spectral components contained in the lamp light, the spectral component in the wavelength band of red light has a spectral component in the wavelength band of another color. Therefore, in order to compensate for the lack of luminous intensity of the spectral component in the wavelength band of red light, a solid light source unit 1a using an LED that emits red light in the same wavelength band as the red light is mainly used. It is the same as the projector 16 of the prior art shown in FIG.

  Here, it is assumed that the value of the cumulative lighting time of the lamp starts from zero.

  The luminous intensity of the projection light from this lamp is shown when the value of the cumulative lighting time of the lamp is zero, that is, the luminous intensity at the start of lamp use, as the number of times the projector is used and the cumulative lighting time of the lamp increases. 2 gradually decreases like the luminous intensity 26 of the lamp shown in FIG.

  In addition, switching control is performed so that the luminous intensity 21 of the red light projected from the solid-state light source unit 1a gradually decreases step by step as shown in FIG. In the case of FIG. 2, when the value of the cumulative lighting time of the lamp reaches a predetermined value, switching control is performed so as to decrease stepwise, and switching control is performed at three points A, B, and C. The case to be done is shown.

  The lamp lighting time management unit 2 stores the value of the cumulative lighting time of the lamp every time the projector is used. When the value of the cumulative lighting time of the lamp reaches a predetermined value (point A in FIG. 2), The first lamp lighting cumulative time signal 27 is output to the control unit 5.

  The control unit 5 that has received the first lamp lighting cumulative time signal 27 from the lamp lighting time management unit 2 generates the first red light intensity reduction control signal 28 based on the first lamp lighting cumulative time signal 27. Output to the supply current switching control unit 3.

  When the supply current switching control unit 3 receives the first red light intensity reduction control signal 28 output from the control unit 5, the light intensity of the red light projected from the solid light source unit 1a (the lamp intensity in FIG. 2). The luminous intensity indicated by the luminous intensity 21 of the red light from the start point of use to the point A is lower than the luminous intensity at that time with a predetermined value (the red light of the part from the point A to the point B in FIG. 2). Therefore, the current value supplied to the solid-state light source unit 1a is determined from the current value of the lamp to the cumulative lighting time of the lamp indicated by the first lamp lighting cumulative time signal. A switching circuit control instruction signal 29b for instructing current switching control so as to decrease to a predetermined current value corresponding to the value is output to the supply current switching unit 4.

  Note that the operating states of the switches 6a to 6d shown in FIG. 1 indicate that during the period from the start of use of the lamp to the point A in FIG. When the lighting time management unit 2 is reset by the control of the control unit 5, the switch 6 a that is on-controlled by the switching circuit control instruction signal 29 a output from the supply current switching control unit 3 based on the control from the control unit 5 at the same time. Is in the operating state, and the resistor 7a is connected to the power supply ground by the operation of the switch 6a. The value of the resistor 7a is the intensity of the red light projected from the solid state light source, and the use of the lamp of FIG. The light intensity is set to a value indicated by the light intensity 21 of the red light from the time point to the point A.

  The supply current switching control unit 3 that has output the first red luminous intensity reduction control signal 28 from the control unit 5 turns off the switch 6a of the supply current switching unit 4 that has been operating until then by the switching circuit control instruction signal 29a. The resistor of the solid-state light source unit 1a that is controlled and has a resistance value set in advance so that the value of the current supplied to the solid-state light source unit 1a becomes the value indicated by the first red light intensity reduction control signal 28 In order to select 7b, the switch 6b of the supply current switching unit 4 is turned on by the switching circuit control instruction signal 29b, and the resistor 7b is connected to the power supply ground. The resistor 7b is set to such a value that the luminous intensity of the red light projected from the solid-state light source unit 1a becomes the luminous intensity indicated by the line 21 from the point A to the point B in FIG. The current value supplied to the solid-state light source unit 1a is switched by switching from the resistor 7b to the resistor 7b, and the luminous intensity of the red light projected from the solid-state light source unit 1a is red in the portion from point A to point B in FIG. It is switched to the light intensity indicated by the light intensity 21.

  The lamp operating time management unit 2 stores the value of the cumulative lighting time of the lamp every time the projector is used, and further reaches the point B in FIG. 2 where the value of the cumulative lighting time of the lamp is a predetermined value. The second lamp lighting cumulative time signal 27 is output to the control unit 5.

  The control unit 5 that has received the second lamp lighting cumulative time signal 27 from the lamp lighting time management unit 2 receives the second lamp lighting cumulative time signal 27 in the same manner as when the first lamp lighting cumulative time signal 27 is received. The second red light intensity reduction control signal 28 is generated based on the above and output to the supply current switching control unit 3.

  When the supply current switching control unit 3 also receives the second red light intensity reduction control signal 28 output from the control unit 5, the light intensity of the red light projected from the solid light source unit 1a (point A in FIG. 2). In order to perform control to lower the luminous intensity indicated by the line 21 from the point B to the point B) to a predetermined value of luminous intensity (luminous intensity indicated by the line 21 from the point B to the point C in FIG. 2). The switching circuit control instruction signal 29 c is output to the supply current switching unit 4.

  The supply current switching unit 4 that outputs the switching circuit control instruction signal 29c from the control unit 5 controls the switch 6c to be turned on by the switching circuit control instruction signal 29c so that the resistor 7c of the solid-state light source unit 1a is connected to the power supply ground. Then, the supply current to the solid light source unit 1a is switched. The current value supplied to the solid-state light source unit 1a is switched by this switching, and the luminous intensity of the red light projected from the solid-state light source unit 1a is the luminous intensity indicated by the line 21 in the portion from point B to point C in FIG. Is switched to.

  As described above, the lamp lighting time management unit 2 stores the value of the cumulative lighting time of the lamp every time the projector is used, and when the value of the cumulative lighting time of the lamp reaches points A to C shown in FIG. Each time, the lamp lighting cumulative time signal 27 is output to the control unit 5, and the switching control for the supply current switching unit 4 is performed by the control unit 5 and the supply current switching control unit 3 to be supplied to the solid state light source unit 1 a. Since the current values are sequentially switched, the luminous intensity of the light projected from the sub-light source is determined in advance corresponding to the change in luminous intensity of the projected light of the main light source lamp that decreases as the cumulative lighting time of the main light source lamp increases. The luminous intensity can be lowered, and the balance of luminous intensity among the spectral components of each wavelength band included in the projector projection light can be kept from being lost.

  In the above description, the case where the lack of luminous intensity of the red light of the spectral component of the lamp has been described, but the case where the lack of luminous intensity of the spectral components of other colors may be compensated.

  In the case of FIG. 2, when the cumulative lamp operating time value reaches a predetermined value, switching control is performed so that the lamp gradually decreases, and switching is performed at three points A, B, and C. Although the case where the control is performed is shown, after the value of the cumulative lighting time of the lamp exceeds the point C, a predetermined value D point is further provided so that the switching control is performed there. May be. Alternatively, a warning for lamp replacement may be issued at point D.

  In the above description, the value of the current supplied to the solid-state light source unit 1a has been described by switching the resistor connected to the power supply ground by sequentially switching the plurality of switches 6a to 6d. When all of the plurality of switches 6a to 6d are turned on, that is, when a current is supplied to all of the plurality of resistors 7a to 7d, the luminous intensity of the red light projected from the solid light source of the solid light source unit 1a becomes maximum. Thus, this state is set to the state when the lamp starts to be used, and when the cumulative lighting time of the lamp of the main light source reaches point A, B, or C, the plurality of resistors are connected to the power supply ground. It is also possible to sequentially turn off one switch at a time to reduce the luminous intensity of the red light projected from the solid state light source.

  In addition, the case where a circuit using a resistor and a switch is used for controlling the current supplied to the solid-state light source has been described, but the switch portion is not controlled by the voltage control based on the power supply voltage level and the ground level. You may do it.

It is a block diagram which shows one Embodiment of the projector system of this invention. It is explanatory drawing which shows an example of the switch control operation | movement of the luminous intensity of the red solid light source performed corresponding to progress of the lighting time of the lamp | ramp in the projector system of this invention. It is explanatory drawing which shows the structure of the projector system using the conventional solid light source. It is a circuit diagram which shows the circuit structure of the solid light source used for the projector system of FIG. It is explanatory drawing which shows the relationship between progress of the lighting time of the lamp used for the projector system of FIG. 3, and the luminous intensity change of a lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Solid light source part 2 Lamp lighting time management part 3 Supply current switching control part 4 Supply current switching part 5 Control part 6a-6d Switch 7a-7d Resistor 10 Lamp 11 Color wheel 12 Rod 13 DMD
DESCRIPTION OF SYMBOLS 14 Projection lens 15 Screen 16 Projector 21 Red light intensity 25 Projection light 26 Lamp intensity 27 Lamp lighting accumulation time signal 28 Red light intensity decrease control signal 29a-29d Switching circuit control instruction signal

Claims (4)

(A) a lamp that is a main light source of the projector;
(B) Of the spectral components contained in the light of the lamp, used as a sub-light source of the projector to supplement the luminous intensity of spectral components in a specific wavelength band having a lower luminous intensity than other spectral components, solid-state light source that emits light of a specific wavelength band, in the spectral distribution control method of the projector projection light wherein the projector is counted between the time lit the lamp each time it is used, lighting of the counted said lamp The new time obtained by adding the time to the stored cumulative lighting time value of the lamp from the start of use of the new lamp to the previous use of the projector at the end of use of the projector. Do value of the accumulated lighting time is stored, each time the value of the cumulative lighting time of the lamp reaches a predetermined value, when the cumulative lighting of the lamp A lamp lighting time management means value to output a lamp lighting accumulated time signal indicating that reaches a predetermined value, each time receiving the signal from the lamp lighting time management means, is emitted from the solid-state light source wherein the intensity of the spectral components in a specific wavelength band, lower than the luminous intensity at that time, and control means for controlling a current value supplied to the solid state light source in order to reduce the intensity of the predetermined value, the When the use of the projector is started again after the use of the projector is finished, the control means is configured to control the lamp based on the content indicated by the lamp lighting cumulative time signal stored in the lamp lighting time management unit. to output the lighted accumulated time signals, and wherein reducing the intensity of the solid-state light source based on the output the lamp lighting accumulated time signal Spectral distribution Control in projector projection light. The projector according to claim 1, wherein the lamp as the main light source emits light close to white light, and the spectral component in the specific wavelength band is red light. Spectral distribution control method for projected light. (A) a lamp that emits light close to white light, which is a main light source of the projector,
(B) a solid-state light source that emits red light, which is used as a sub-light source of the projector to supplement red light having a low luminous intensity compared to other spectral components among spectral components contained in the lamp light; In the spectral distribution control method in the projector projection light equipped with
(C) the projector counted value of the lamp lit time each time it is used, at the end of use of the projector, up to the previous of said projectors use from the time you start using the new the lamp, storage When a new cumulative lighting time value obtained by adding to the cumulative lighting time value of the lamp is stored and the use of the projector is started after the use of the projector is finished to the value of the accumulated lighting time of the lamp reaches a predetermined value, the lamp lighting time management unit that outputs a lamp lighting accumulated time signals,
(D) a control unit that outputs a red light intensity reduction control signal for switching the value of the current supplied to the solid state light source based on the input lamp lighting cumulative time signal;
(E) a supply current switching unit having a switching circuit for switching the value of the current supplied to the solid state light source;
(F) Each time the red light intensity reduction control signal is input, control is performed to reduce the intensity of the red light emitted from the solid light source to a predetermined value that is lower than the intensity at that time. In order to do so, the current value supplied to the solid-state light source is previously indicated in the red light intensity reduction control signal corresponding to the value of the cumulative lighting time of the lamp indicated by the lamp lighting cumulative time signal from the current value so far. A supply current switching control unit for outputting a switching circuit control instruction signal for instructing control of a switching circuit of the supply current switching unit, which is necessary for reducing the current value supplied to the solid-state light source to a predetermined value; A spectral distribution control method for projector projection light, comprising: 4. The spectral distribution control method for projector projection light according to claim 3, wherein the control section stores the lamp lighting time management section when the lamp is replaced with a new lamp and lamp replacement information is inputted. A spectrum distribution control method for projector projection light, wherein the cumulative lighting time value of the lamp is deleted, and the storage of the cumulative lighting time value of the new lamp is resumed.

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