JPH06251889A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To provide a discharge lamp lighting device capable of giving the feeling of smoothly increasing and decreasing a light output and conducting comfortable fader-in and fade-out. CONSTITUTION:Fade-in is carried out according to a curve (PHIi2) connecting a first coordinate at fade-in start (T=Tistart) with a light output PHI in dark state (PHI=0) to a second coordinate at fade-in end (T=Tiend) with the light output PHI in bright state (PHI=Yf) and protruding down from the line (PHIi1) passing the first coordinate and the second coordinate. Fade-out is carried out according to a curve (PHIu3) connecting a third coordinate at fade-out start (T=Tustart=0) with the light output in bright state (PHI=Yf) to a forth coordinate at fade-out end (T=Tuend) with the light out PHI in dark state (PHI=0) and protruding upward from the line (PHIu1) passing the third coordinante and the fourth coordinate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a dimming type discharge lamp lighting device for lighting a discharge lamp at a high frequency by using an inverter circuit and having a fade-in function and a fade-out function.

[0002]

2. Description of the Related Art In a conventional discharge lamp lighting device, after the power supplied from an AC power source is converted into a direct current by a rectifier circuit, it is converted into high frequency power by an inverter circuit, and this high frequency power is supplied to a discharge lamp to generate a high frequency power. I'm trying to turn it on. The inverter circuit is provided with an inverter control circuit, and the control signal given from the inverter control circuit to the inverter circuit controls the high frequency power supplied from the inverter circuit to the discharge lamp to control the dimming of the discharge lamp. I am trying to do it.

Further, when the discharge lamp is lit, a fade-in operation is performed to gradually increase the light output from a dark state (zero or dimming lighting state) to a bright state (full lighting state or dimming lighting state), or the discharge lamp. Inverter control circuit has a fade-in function and a fade-out function to perform a fade-out operation that gradually decreases from a bright state (all lighting state or dimming lighting state) to a dark state (zero or dimming lighting state) when is turned off There are many things we are doing.

FIG. 7 shows a light output-time characteristic curve (hereinafter referred to as a fade curve) during fade-in and fade-out in such a conventional discharge lamp lighting device. The same figure (a) shows the fade curve (light output Φ _i1 ) at the time of fade-in, and the same figure (b) shows the fade curve (light output Φ _u1 ) at the time of fade-out. In these figures, the horizontal axis is shown. The time T is taken and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 7A, the fade
The fade curve at the time of in is the optical output-time characteristic diagram,
At the start of fade-in (T = T_istart= 0) and optical output
Is in the dark (unlit) state (Φ = 0) and the fade-in ends
Time (T = T_iend) And the light output is bright (lighted) (Φ =
Y_f) And a straight line (light output Φ_i1) Consists of
Light output of discharge lamp Φ_i1The fade card
Arrow X ₁As shown in, from 0 state to Y
_fGradually increases linearly with time until
It

As can be seen from FIG. 7B, the fade curve at the time of fade-out shows that the light output is _clear when the fade-out is started (T = T _ustart = 0) on the light output-time characteristic diagram. A straight line (light output Φ _u1 ) connecting the coordinates in the (lit) state (Φ = Y _f ) and the coordinates at the end of fade-out (T = T _{ue nd} ) and the light output is in the dark (off) state (Φ = 0)
And the light output of the discharge lamp at fade-out Φ _u1
Along the fade curve, as shown by the arrow X _2,
From the state of Y _{f to} the state of 0, it gradually decreases linearly with the passage of time.

That is, at the time of fade-in, the light output Φ _i1 of the discharge lamp is from 0 to the target Y _f , and the time T
Increases in direct proportion to. The light output Φ _i1 here is represented by Φ _i1 = a _i T, where the rate of increase of the light output Φ _i1 with respect to time T is constant in any section and a _i is a constant coefficient. Further, at the time of fade-out, the light output Φ _u1 of the discharge lamp decreases from the initial Y _f to 0 in direct proportion to the time T. The optical output Φ _u1 here is such that the decrease rate of the optical output Φ _u1 with respect to time T is constant in any section, and a _u
Is a constant coefficient, it is represented by Φ _u1 = Y _f −a _u T.

Furthermore, the fade curve at the time of fade-in in FIG. 7 (a) and the fade curve at the time of fade-out in FIG. 7 (b) have the same rate of change of the optical outputs Φ _i1 and Φ _u1 with time, and a _i = − a _u . In summary, both the fade-in and the fade-out in the conventional example change the light output in a linear function, and the slopes of increase and decrease of the light output are the same in the fade-in and the fade-out. In other words, the fade curve is symmetrical between fade-in and fade-out.

[0009]

SUMMARY OF THE INVENTION In the above-mentioned conventional example,
At the time of fading in, the light output of the discharge lamp is linearly increased, so it is not possible for the human eye to see it to suddenly feel bright and to feel that the light output is increasing smoothly. , I couldn't say that I was doing a comfortable fade-in. This also gives a feeling of glare. This is especially true in a completely dark room
It appears remarkably when you fade in, and the cause is
This is because the pupil of the eye cannot follow the change in brightness due to fade-in.

Further, since the light output of the discharge lamp is linearly reduced at the time of fading out, the eyes of a person who sees the discharge lamp suddenly feels as if the light output suddenly becomes dark and the light output is smoothly reduced. I couldn't do that, and I couldn't say I was doing a comfortable fade out. In addition, this also gives a feeling of anxiety without getting used to the darkness. The reason is that the pupil of the eye cannot follow the change in brightness due to the fade-out as in the case of the fade-in.

It should be noted that in lighting of a theater or a facility for performing a performance, it is only required to make the user feel that the light output is smoothly increasing at the time of fading in, or the light output is smoothly decreasing at the time of fading out. In some cases, it is not always required to make the user feel that the light output changes smoothly in both fade-in and fade-out. .

The structure of the proposed fade-in and fade-out examples will be described below. FIG. 8 shows an example in which the fade curves of the fade-in and the fade-out are symmetrical and curved (puffed downward).
The same figure (a) shows the fade curve (light output Φ _i2 ) at the time of fade-in, and the same figure (b) shows the fade curve (light output Φ _u2 ) at the time of fade-out. In these figures, the horizontal axis is shown. The time T is taken and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 8 (a), the fade curve at the time of fade-in is
_Coordinates when the fade-in starts (T = T _istart = 0) and the light output is dark (OFF) (Φ = 0) and when the fade-in ends (T = T _iend ) and the light output is bright (lighted) (Φ =
Y _f ), and a downwardly bulging curve (Φ _i2 <A _i T) connecting the above two coordinates (Φ _i1 = a _i T)
a _i T), and the light output Φ _i2 of the discharge lamp at the time of fade-in gradually increases with time from the state of 0 to the state of Y _f along the fade curve, as shown by the arrow Y ₁ . At this time, the light output Φ _i2 has a small change rate at a low level in the initial stage of fade-in, and has a large change rate at a high level at the final stage of fade-in.

Further, as can be seen from FIG. 8 (b),
The fade curve during fade-out is the optical output-time characteristic
In the figure, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the card out (T = T_{ue nd}) And the light output is dark (off
(Light) state (Φ = 0) coordinates and the above two seats
A straight line passing through the mark (Φ_u1= Y_f-A_uWipe downward from T)
Random curve (Φ_u2<Y _f-A_uT) consists of and fades
Light output Φ of discharge lamp when out_u2Is the fade curve
Along the arrow Y₂, As shown in Y_fFrom the state of 0
It gradually increases to the state over time. At this time, light
Output Φ_u2Changes at high levels early in the fade out
High rate, changes at low level at the end of fade-out
The rate becomes smaller.

When the light output of the discharge lamp is changed according to the fade-in curve of fade-in and fade-out as described above, the change rate at the time of low light output is small at the time of fade-in, and it does not seem to be suddenly brightened. A comfortable, eye-friendly fade-in can be performed. However, at the time of fade-out, the rate of change at high light output is large, so it becomes a fade-out that makes you suddenly feel dark and makes you feel uneasy, which is worse than a fade-out that decreases light output linearly. It is in a state.

FIG. 9 shows an example in which the fade-in curves of fade-in and fade-out are symmetrical and curved (bulging upward). The figure (a) shows the fade curve (optical output Φ _i3 ) at the time of fade-in,
FIG. 11B shows a fade curve (optical output Φ _u3 ) at the time of fading out. In these figures, the horizontal axis represents time T.
And the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 9 (a), the fade curve at the time of fade-in is as follows on the optical output-time characteristic diagram.
_Coordinates when the fade-in starts (T = T _istart = 0) and the light output is dark (OFF) (Φ = 0) and when the fade-in ends (T = T _iend ) and the light output is bright (lighted) (Φ =
Y _f ), and a curve (Φ _i3 >) that bulges upward from a straight line (Φ _i1 = a _i T) that connects the coordinates of Y _f ).
a _i T), and the light output Φ _i3 of the discharge lamp at the time of fade-in gradually increases with time from the state of 0 to the state of Y _f along the fade curve as indicated by arrow Z ₁ . At this time, the optical output Φ _i3 has a large change rate at a low level in the initial stage of fade-in and a small change rate at a high level at the final stage of fade-in.

As can be seen from FIG. 9 (b), the frame
The fade curve during fade-out is the optical output-time characteristic
In the figure, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the card out (T = T_{ue nd}) And the light output is dark (off
(Light) state (Φ = 0) coordinates and the above two seats
A straight line passing through the mark (Φ_u1= Y_f-A_uT) wipe upward
Random curve (Φ_u3> Y _f-A_uT) consists of and fades
Light output Φ of discharge lamp when out_u3Is the fade curve
Along the arrow Z₂, As shown in Y_fFrom the state of 0
It gradually increases to the state over time. At this time, light
Output Φ_u3Changes at high levels early in the fade out
Low rate, changes at low level at the end of fade out
The rate increases.

When the light output of the discharge lamp is changed according to the fade-in curve of the fade-in and the fade-out as described above, at the time of fade-out, the rate of change at the time of high light output is small, so that it does not feel suddenly bright. You can do a comfortable fade out. However, at the time of fade-in, the rate of change at a low light output is large and suddenly makes the user feel as if it were bright, resulting in discomfort. This is a worse situation than a fade-in, which reduces the light output linearly.

FIG. 10 shows an example in which the fade-in curve for fade-in is a straight line and the fade curve for fade-out is a curve (bulging downward). The figure (a) shows the fade curve (light output Φ
_i1 ), and FIG. 6 (b) shows a fade curve (light output Φ _u2 ) at the time of fading out. In these figures,
The time T is plotted on the horizontal axis and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 10 (a), the fade curve at the time of fade-in shows that the fade-in is at the start of fade-in (T = T _istart = 0) and the light output is dark in the light output-time characteristic diagram. A straight line (Φ _i1 = a _i ) connecting the coordinates in the (off) state (Φ = 0) and the coordinates when the fade-in is completed (T = T _iend ) and the light output is in the bright (lighted) state (Φ = Y _f ). T), and the light output Φ _i1 of the discharge lamp at the time of fade-in gradually increases linearly with the passage of time from the state of 0 to the state of Y _f along the fade curve as indicated by arrow X _1. .

As can be seen from FIG. 10 (b),
The fade curve during fade-out is
On the sex diagram, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the fade-out (T = T _uend) And the light output is dark
Connect the coordinates of the (off) state (Φ = 0), and
A straight line passing through the coordinates of (Φ_u1= Y_f-A_uT) downward
Puffy curve (Φ_u2<Y_f-A_uT) consists of
Light output Φ of discharge lamp during burnout_u2The fade card
Arrow Y₂, As shown in Y_fFrom the state of
It gradually increases with the passage of time until it reaches 0. this
When the optical output Φ_u2At a high level at the beginning of the fade-out
The rate of change is large, and at the low level at the end of fade-out
The rate of change becomes small.

When the light output of the discharge lamp is changed according to such fade-in and fade-out fade curves, the change rate at the time of low light output is large at the time of fade-in, and it is felt as if it suddenly became bright. Is similar to the conventional example. Also, since the rate of change at high light output is large during fade-out, it becomes a fade-out that makes you suddenly feel dark and gives you anxiety, which is worse than a fade-out that decreases light output linearly. It is in a state.

FIG. 11 shows a fade-in fade-in curve.
Curved (bulging upwards) and faded out
The fade curve is a curve (bulging downward)
The following shows an example of the case. Figure (a) shows when fade-in
Fade curve (light output Φ _i3) Is shown in FIG.
Fade curve (light output Φ_u2)
However, in these figures, the horizontal axis represents time T and the vertical axis represents
The optical output is Φ.

As can be seen from FIG. 11A, the fader
The fade curve at the time of doin is shown on the optical output-time characteristic diagram.
At the start of fade-in (T = T_istart= 0) and light
Output is in dark (off) state (Φ = 0) and fades in
At the end (T = T_iend) And the light output is bright (lit)
(Φ = Y_f) And the above two coordinates.
Straight line (Φ_i1= A_iT) Curve bulging upward
(Φ_i3> A_iT) and discharge run at fade-in
Optical output Φ_i3Is the arrow Z along the fade curve. ₁
As shown in, from 0 state to Y_fTime has passed
Gradually increases with. At this time, the optical output Φ_i3Fah
The rate of change is large and fades at a low level at the beginning of the doin
The rate of change decreases at high levels at the end of the period.

As can be seen from FIG. 11 (b),
The fade curve during fade-out is
On the sex diagram, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the fade-out (T = T _uend) And the light output is dark
Connect the coordinates of the (off) state (Φ = 0), and
A straight line passing through the coordinates of (Φ_u1= Y_f-A_uT) downward
Puffy curve (Φ_u2<Y_f-A_uT) consists of
Light output Φ of discharge lamp during burnout_u2The fade card
Arrow Y₂, As shown in Y_fFrom the state of
It gradually increases with the passage of time until it reaches 0. this
When the optical output Φ_u2At a high level at the beginning of the fade-out
The rate of change is large, and at the low level at the end of fade-out
The rate of change becomes small.

When the light output of the discharge lamp is changed according to the fade-in curve of the fade-in and the fade-out as described above, the change rate at the time of low light output is large at the time of fade-in, and it feels as if it suddenly became bright, which is uncomfortable. , Which is worse than the fade-in that linearly increases the light output. Also, at the time of fade-out, the rate of change at high light output is large, so it becomes a fade-out that makes you feel suddenly dark and makes you feel uneasy.
It is worse than fade-out, which decreases the light output linearly.

FIG. 12 shows an example in which the fade-in fade-in curve is a curve (bulging upward) and the fade-curve fade-out is a straight line. The figure (a) shows the fade curve (light output Φ
_i3 ), and FIG. 6 (b) shows a fade curve (optical output Φ _u1 ) at the time of fading out. In these figures,
The time T is plotted on the horizontal axis and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 12 (a), the fader
The fade curve at the time of doin is shown on the optical output-time characteristic diagram.
At the start of fade-in (T = T_istart= 0) and light
Output is in dark (off) state (Φ = 0) and fades in
At the end (T = T_iend) And the light output is bright (lit)
(Φ = Y_f) And the above two coordinates.
Straight line (Φ_i1= A_iT) Curve bulging upward
(Φ_i3> A_iT) and discharge run at fade-in
Optical output Φ_i3Is the arrow Z along the fade curve. ₁
As shown in, from 0 state to Y_fTime has passed
Gradually increases with. At this time, the optical output Φ_i3Fah
The rate of change is large and fades at a low level at the beginning of the doin
The rate of change decreases at high levels at the end of the period.

As can be seen from FIG. 12 (b),
The fade curve during fade-out is
On the sex diagram, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the fade-out (T = T _uend) And the light output is dark
A straight line (Φ) that connects to the coordinates in the (off) state (Φ = 0)_u1= Y
_f-A_iT) and discharge lamp at the time of fade-out
Light output of Φ_u1Is an arrow X along the fade curve₂so
As shown, Y_fFrom the state of 0 to the state of 0
Both decrease linearly.

When the light output of the discharge lamp is changed in accordance with the fade-in curve of the fade-in and the fade-out as described above, the change rate at the time of low light output is large at the time of fade-in, and it feels as if it suddenly became bright, which is uncomfortable. , Which is worse than the fade-in that linearly increases the light output. Further, at the time of fade-out, the rate of change at the time of high light output is large, so that the fade-out gives a feeling of sudden darkness and gives anxiety.

An object of the present invention is to provide a discharge lamp lighting device which makes it possible to make the user feel that the light output is increasing smoothly and can perform a comfortable fade-in. An object of the present invention is to provide a discharge lamp lighting device that makes it possible to make the user feel that the light output is decreasing smoothly and can perform a comfortable fade-out.

[0033]

A discharge lamp lighting device according to a first aspect of the present invention, as shown in FIG. 1 (a), shows a fade-in start time (T = T _istart = 0 on a light output-time characteristic diagram). ) And the light output Φ is in the dark state (Φ = 0) and at the end of the fade-in (T = T _iend ), and the light output Φ is in the bright state (Φ
= Y _f ) and the first coordinate and the second coordinate
Fade-in is performed according to a downwardly bulging curve (Φ _i2 ) than a straight line (Φ _i1 ) passing through and the coordinates of. There is no particular limitation regarding fade-out.

A discharge lamp lighting device according to a second aspect of the invention is shown in FIG.
As shown in (b), on the light output-time characteristic diagram, the first coordinates when the fade-out starts (T = T _ustart = 0) and the light output Φ is in the bright state (Φ = Y _f ) and the fade-out end Time (T = T _uend ), the light output Φ connects with the second coordinates in the dark state (Φ = 0), and is upward from the straight line (Φ _u1 ) that passes through the first coordinates and the second coordinates. Fade out is performed according to the bulging curve (Φ _u3 ). There is no particular limitation regarding fade-in.

The discharge lamp lighting device according to claim 3 is as shown in FIG.
As shown in (a), on the light output-time characteristic diagram, when the fade-in is started (T = T _istart = 0) and the light output Φ is in the dark state (Φ = 0), the fade-in is performed. At the end (T
= T _iend ) and the light output Φ is in the bright state (Φ = Y _f ).
Fade in according to a curve (Φ _i2 ) that is downwardly swelling from a straight line (Φ _i1 ) that connects the coordinates of and that passes through the first coordinate and the second coordinate, as shown in FIG. 1 (b). ,
On the optical output-time characteristic diagram, when fade-out starts (T =
T _ustart = 0) and the third coordinate when the light output Φ is in the bright state (Φ = Y _f ), and the fourth coordinate when the fade-out end (T = T _uend ) and the light output Φ is in the dark state (Φ = 0). Connect with the coordinates of
In addition, the fade-out is performed according to the curve (Φ _u3 ) which is bulged upward from the straight line (Φ _u1 ) passing through the third coordinate and the fourth coordinate.

The discharge lamp lighting device according to claim 4 is as shown in FIG.
As shown in (a), on the light output-time characteristic diagram, when the fade-in is started (T = T _istart = 0) and the light output Φ is in the dark state (Φ = 0), the fade-in is performed. At the end (T
= T _iend ) and the light output Φ is in the bright state (Φ = Y _f ).
Fade in according to a curve (Φ _i2 ) that is downwardly swelling from a straight line (Φ _i1 ) that connects the coordinates of and that passes through the first coordinate and the second coordinate, as shown in FIG. 1 (b). ,
On the optical output-time characteristic diagram, when fade-out starts (T =
T _ustart = 0) and the third coordinate when the light output Φ is in the bright state (Φ = Y _f ), and the fourth coordinate when the fade-out end (T = T _uend ) and the light output Φ is in the dark state (Φ = 0). Fade out is performed according to the straight line (Φ _u1 ) connecting with the coordinates of.

The discharge lamp lighting device according to claim 5 is as shown in FIG.
As shown in (a), on the light output-time characteristic diagram, when the fade-in is started (T = T _istart = 0) and the light output Φ is in the dark state (Φ = 0), the fade-in is performed. At the end (T
= T _iend ) and the light output Φ is in the bright state (Φ = Y _f ).
Fade in according to the straight line (Φ _i1 ) connecting with the coordinates of, and as shown in FIG. 1 (b), when the fade out starts (T = T _ustart = 0) and the optical output is shown on the optical output-time characteristic diagram. Φ _connects the third coordinate in the bright state (Φ = Y _f ) and the fourth coordinate at the end of the fade-out (T = T _uend ) and the light output Φ is in the dark state (Φ = 0), and the third coordinate Fade-out is performed according to a curve (Φ _u3 ) that is bulged upward from a straight line (Φ _u1 ) that passes through the coordinates of and the fourth coordinates.

[0038]

According to the structure of the present invention, at the time of fade-in, the light output of the discharge lamp increases gradually at first and then increases rapidly, and the change of the pupil of the eye is caused by the increase of the light output of the discharge lamp. Can be followed, and the discharge lamp can be made to feel smoothly increasing without causing the discharge lamp to suddenly become bright, and a comfortable fade-in can be performed.

Further, at the time of fade-out, the light output of the discharge lamp decreases gradually at first and then decreases rapidly, and the change of the pupil of the eye can follow the decrease of the light output of the discharge lamp, and the discharge It is possible to make the user feel that the light output is decreasing smoothly without feeling that the lamp suddenly became dark, and to perform a comfortable fade-in.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] This discharge lamp lighting device has a fade-in function of gradually increasing the light output of the discharge lamp from a dark state to a bright state with time, and a light output of the discharge lamp from a bright state to a dark state. In a discharge lamp lighting device having a fade-out function that gradually decreases until time elapses, fade-in is performed according to a fade curve as shown in FIG. 2 (a), and fade-out is performed as shown in FIG. 2 (b). I'm trying to do.

FIG. 2 shows an example in which a fade-in fade-in curve is a curve (bulging downward) and a fade-curve fade-out is a curve (bulging upward). The same figure (a) shows the fade curve (light output Φ _i2 ) at the time of fade-in, and the same figure (b) shows the fade curve (light output Φ _u3 ) at the time of fade-out. In these figures, the horizontal axis is shown. The time T is taken and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 2 (a), the fade curve at the time of fade-in is shown on the optical output-time characteristic diagram as
_Coordinates when the fade-in starts (T = T _istart = 0) and the light output is dark (OFF) (Φ = 0) and when the fade-in ends (T = T _iend ) and the light output is bright (lighted) (Φ =
Y _f ), and a downwardly bulging curve (Φ _i2 <A _i T) connecting the above two coordinates (Φ _i1 = a _i T)
a _i T), and the light output Φ _i2 of the discharge lamp at the time of fade-in gradually increases with time from the state of 0 to the state of Y _f along the fade curve, as shown by the arrow Y ₁ . At this time, the light output Φ _i2 has a small change rate at a low level in the initial stage of fade-in, and has a large change rate at a high level at the final stage of fade-in.

As can be seen from FIG. 2 (b), the frame
The fade curve during fade-out is the optical output-time characteristic
In the figure, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the card out (T = T_{ue nd}) And the light output is dark (off
(Light) state (Φ = 0) coordinates and the above two seats
A straight line passing through the mark (Φ_u1= Y_f-A_uT) wipe upward
Random curve (Φ_u3> Y _f-A_uT) consists of and fades
Light output Φ of discharge lamp when out_u3Is the fade curve
Along the arrow Z₂, As shown in Y_fFrom the state of 0
It gradually increases to the state over time. At this time, light
Output Φ_u3Changes at high levels early in the fade out
Low rate, changes at low level at the end of fade out
The rate increases.

Here, a specific structure of the discharge lamp lighting device of this embodiment will be described with reference to FIG. As shown in FIG. 3, this discharge lamp lighting device performs full-wave rectification on a power supply voltage of an AC power supply AC by a full-wave rectification circuit DB ₁ and includes the obtained pulsating current voltage with switching elements Q ₁ and Q ₂ . In addition to the configured inverter circuit IN ₁ , it is converted into a high frequency and applied between both filaments of the discharge lamp DL ₁ via the resonance circuit consisting of the inductor L ₁ and the capacitor C ₁ from the inverter circuit IN ₁ to discharge the discharge lamp DL _1. Is turned on at high frequency. The preheating current of both filaments of the discharge lamp DL ₁ is supplied from the inverter circuit IN ₁ through the preheating transformer T ₁ . Inverter circuit IN ₁
May have any configuration such as a half-bridge type and is a configuration capable of continuously changing the output from 0 to full. The resonance circuit is provided to change the power supplied to the discharge lamp DL ₁ .

The controller CR ₁ for controlling the switching operation of the inverter circuit IN ₁ includes a switching element Q _1, Q
Inverter control unit IC ₁ for controlling switching of ₂
And it consists fade-in and fade-out control unit FC ₁ Metropolitan for controlling the fade-in and fade-out, for example, the dimming signal from the outside (the lighting, including off signal) received by fade-in and fade-out control unit FC _1, fade- -The fade-out control unit FC ₁ sends a signal to the inverter control unit IC ₁ so that the discharge lamp DL ₁
The fade-in operation is performed when the lamp is turned on, the fade-out operation is performed when the lamp is turned off, and the dimming operation of the discharge lamp DL ₁ is also performed.

At this time, the inverter control unit IC ₁ changes the switching frequency of the switching elements Q ₁ and Q _{2 in} accordance with the signal from the fade-in / fade-out control unit FC ₁ , so that the discharge lamp DL passes through the resonance circuit.
_The supplied power is changed to ₁ and the discharge lamp D
L ₁ of dimming, fade-in, fade-out is performed. Further, the fade-in / fade-out control unit FC ₁ receives the dimming signal and sends a signal to the inverter control unit IC ₁ so that the inverter output changes according to the dimming curve and the fade curve. In this case, as the control element, one using a time constant of a capacitor and a resistor, one performing an operation similar to the above by an integrated circuit, or one having a microcomputer built therein and performing an operation similar to the above is considered.

The form of the dimming signal may be any. Further, the dimming signal also includes a case where it is an on / off signal of a switch that simply turns on and off the discharge lamp DL ₁ . The control unit CR ₁ includes a step-down transformer T ₂ , a full-wave rectifier circuit DB ₂
The operating power is supplied from the circuit composed of the capacitor C ₃ and the capacitor C ₃ . Next, another specific configuration of the discharge lamp lighting device will be described with reference to FIG.

In this discharge lamp lighting device, as shown in FIG. 4, the voltage of the AC power supply AC is full-wave rectified by the full-wave rectifier circuit DB ₁ , and the obtained pulsating voltage is converted into a high frequency by the inverter circuit IN _2. From the inverter circuit IN ₂ to the discharge lamp DL
High frequency power is supplied to ₁ . The inverter circuit IN ₂ receives a signal from the inverter control unit IC ₂ and performs a high frequency conversion operation. Inverter control circuit IC
₂ is supplied with operating power from a circuit including a step-down transformer T ₃ , a full-wave rectifier circuit DB ₂ and a capacitor C ₃ .

The control of dimming, fade-in and fade-out is performed by a dimmer TS ₁ with a built-in microcomputer, which operates by being supplied with power from an AC power supply AC. Here, the inverter control unit IC ₂ controls the power supplied from the inverter circuit IN ₂ to the discharge lamp DL ₂ by the dimming signal. The dimmer TS ₁ is configured to send a dimming signal to the inverter control unit IC ₂ by a microcomputer or the like, and this signal controls the power supplied from the inverter circuit IN ₂ to the discharge lamp DL ₁ . , Dimming, fade in, fade out.

When the light output of the discharge lamp is changed according to such fade-in and fade-out fade curves, the rate of change at the time of low light output is small at the time of fade-in, and it does not seem to suddenly become bright. A comfortable, eye-friendly fade-in can be performed. Moreover, since the rate of change at the time of high light output is small at the time of fade-out, it is possible to perform a comfortable fade-out without making the user suddenly feel bright.

In the following examples, although the circuit configuration of the discharge lamp lighting device is omitted, the discharge lamp lighting device shown in FIG. 3 or 4 can be used. [Second Embodiment] This discharge lamp lighting device has a fade-in function of gradually increasing the light output of the discharge lamp from a dark state to a bright state over time, and the light output of the discharge lamp from a bright state to a dark state. In a discharge lamp lighting device having a fade-out function of gradually decreasing until time passes, fade-in is performed according to a fade curve as shown in FIG. 5 (a), and fade-out is performed as shown in FIG. 5 (b). I'm trying to do.

FIG. 5 shows an example in which the fade-in curve of fade-in is a curve (bulging downward) and the fade-curve of fade-out is a straight line. The figure (a) shows the fade curve (light output Φ _i2 ) at the time of fade-in, and the figure (b) shows the fade curve (light output Φ _u1 ) at the time of fade-out. In these figures, the horizontal axis is shown. The time T is taken and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 5A, the fade curve during fade-in is
_Coordinates when the fade-in starts (T = T _istart = 0) and the light output is dark (OFF) (Φ = 0) and when the fade-in ends (T = T _iend ) and the light output is bright (lighted) (Φ =
Y _f ), and a downwardly bulging curve (Φ _i2 <A _i T) connecting the above two coordinates (Φ _i1 = a _i T)
a _i T), and the light output Φ _i2 of the discharge lamp at the time of fade-in gradually increases with time from the state of 0 to the state of Y _f along the fade curve, as shown by the arrow Y ₁ . At this time, the light output Φ _i2 has a small change rate at a low level in the initial stage of fade-in, and has a large change rate at a high level at the final stage of fade-in. Also, FIG.
As can be seen from (b), the fade curve at the time of fade-out _shows that the light output is clear (lighted) when the fade-out starts (T = T _ustart = 0) on the light output-time characteristic diagram.
The coordinates of the state (Φ = Y _f ) and the end of the fade-out (T =
T _{ue nd} ) and the light output is a straight line (Φ _u1 = Y _f −a _i T) connecting with the coordinates of the dark (unlit) state (Φ = 0), and the light output Φ _u1 of the discharge lamp at the time of fade-out is Along the fade curve, as shown by the arrow X ₂ , it gradually decreases linearly with the passage of time from the state of Y _{f to} the state of 0.

When the light output of the discharge lamp is changed in accordance with such a fade-in fade curve, the rate of change at the time of low light output is small at the time of fade-in, and it does not feel suddenly bright and is comfortable. You can perform a fade-in that is easy on the eyes. [Third Embodiment] This discharge lamp lighting device has a fade-in function of gradually increasing the light output of the discharge lamp from a dark state to a bright state with the lapse of time, and the light output of the discharge lamp from the bright state to the dark state. In a discharge lamp lighting device having a fade-out function that gradually decreases with the passage of time, fade-in is performed according to a fade curve as shown in FIG. 6A, and fade-out is performed as shown in FIG. 6B. I'm trying to do.

FIG. 6 shows an example in which the fade curve for fade-in is a straight line and the fade curve for fade-out is a curve (bulging upward). The same figure (a) shows the fade curve (light output Φ _i1 ) at the time of fade-in, and the same figure (b) shows the fade curve (light output Φ _u3 ) at the time of fade-out. In these figures, the horizontal axis is shown. The time T is taken and the optical output Φ is plotted on the vertical axis.

As can be seen from FIG. 6A, the fade curve at the time of fade-in is
_Coordinates when the fade-in starts (T = T _istart = 0) and the light output is dark (OFF) (Φ = 0) and when the fade-in ends (T = T _iend ) and the light output is bright (lighted) (Φ =
Y _f ) _{consisting of} a straight line (Φ _i1 = a _i T) connecting to the coordinates,
At the time of fade-in, the light output Φ _i1 of the discharge lamp gradually increases linearly along the fade curve from time 0 to time Y _f , as indicated by arrow X ₁ .

As can be seen from FIG. 6 (b), the frame
The fade curve during fade-out is the optical output-time characteristic
In the figure, at the start of fade-out (T = T_ustart= 0)
And the light output is bright (lit) (Φ = Y_f) Coordinates and
At the end of the card out (T = T_{ue nd}) And the light output is dark (off
(Light) state (Φ = 0) coordinates and the above two seats
A straight line passing through the mark (Φ_u1= Y_f-A_uT) wipe upward
Random curve (Φ_u3> Y _f-A_uT) consists of and fades
Light output Φ of discharge lamp when out_u3Is the fade curve
Along the arrow Z₂, As shown in Y_fFrom the state of 0
It gradually increases to the state over time. At this time, light
Output Φ_u3Changes at high levels early in the fade out
Low rate, changes at low level at the end of fade out
The rate increases.

When the light output of the discharge lamp is changed according to such a fade-out fade curve, the rate of change at the time of high light output is small at the time of fade-out, so that it does not feel suddenly bright and is comfortable. You can fade out. Note that the dimming lighting function of the discharge lamp may be omitted.

The fade curve at the time of fade-in and fade-out does not have to be a smooth curve, and may be, for example, stepwise.

[0060]

According to the discharge lamp lighting device of the present invention, the first coordinates when the fade-in starts and the light output is in the dark state and the second coordinates when the fade-in ends and the light output is in the bright state are provided. And the fade-in is performed according to a curve bulging downward from the straight line passing through the first coordinate and the second coordinate, the light output of the discharge lamp increases gradually at the time of fade-in. , Then, it will increase rapidly, the change in the pupil of the eye can follow the increase in the light output of the discharge lamp, and the light output increases smoothly without making the discharge lamp feel suddenly bright. You can feel it and perform a comfortable fade-in.

Also, the first coordinates at the start of the fade-out and the light output being in the bright state are connected to the second coordinates at the end of the fade-out and the light output being in the dark state, and the first coordinates and the second coordinates are connected. Since the fadeout is performed according to a curve bulging upward from the straight line passing through and, at the time of fadeout, the light output of the discharge lamp decreases gradually at first, and then decreases rapidly. The change in the pupil of the eye can follow the decrease in the output, so that the discharge lamp does not feel suddenly dark, and the light output can be felt smoothly decreasing, making a comfortable fade-in. You can

[Brief description of drawings]

FIG. 1 is a light output-time characteristic diagram showing the states of fade-in and fade-out of a discharge lamp lighting device of the present invention.

FIG. 2 is a light output showing a state of fade-in and fade-out of the discharge lamp lighting device according to the first embodiment of the present invention.
It is a time characteristic diagram.

FIG. 3 is a block diagram showing a configuration of an example of a discharge lamp lighting device to which the present invention is applied.

FIG. 4 is a block diagram showing the configuration of another example of the discharge lamp lighting device to which the present invention is applied.

FIG. 5 is an optical output showing the states of fade-in and fade-out of the discharge lamp lighting device according to the second embodiment of the present invention.
It is a time characteristic diagram.

FIG. 6 is an optical output showing the states of fade-in and fade-out of the discharge lamp lighting device according to the third embodiment of the present invention.
It is a time characteristic diagram.

FIG. 7 is a light output-time characteristic diagram showing a state of fade-in and fade-out of a conventional discharge lamp lighting device.

FIG. 8 is a light output-time characteristic diagram showing the states of fade-in and fade-out of the discharge lamp lighting device of the proposed example.

FIG. 9 is a light output-time characteristic diagram showing the states of fade-in and fade-out of the discharge lamp lighting device of the proposed example.

FIG. 10 is a light output-time characteristic diagram showing the states of fade-in and fade-out of the discharge lamp lighting device of the proposed example.

FIG. 11 is a light output-time characteristic diagram showing the states of fade-in and fade-out of the discharge lamp lighting device of the proposed example.

FIG. 12 is a light output-time characteristic diagram showing the states of fade-in and fade-out of the discharge lamp lighting device of the proposed example.

[Explanation of symbols]

Φ _i1 straight line Φ _i2 curved line Φ _u1 straight line Φ _u3 curved line

Front page continuation (72) Inventor Yoshifumi Kuroki 1048, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (5)

[Claims] 1. A discharge lamp lighting device having a fade-in function for gradually increasing the light output of a discharge lamp from a dark state to a bright state with time, wherein time is plotted on the horizontal axis and light output is plotted on the vertical axis. In the light output-time characteristic diagram, the first coordinate when the fade-in is started and the light output is dark and the second coordinate when the fade-in is finished and the light output is bright
The discharge lamp lighting device is characterized in that the fade-in is performed in accordance with a curved line which is downwardly swelled below a straight line which connects the coordinate of the above and the line passing through the first coordinate and the second coordinate. 2. In a discharge lamp lighting device having a fade-out function for gradually reducing the light output of a discharge lamp from a bright state to a dark state with time, the horizontal axis represents time and the vertical axis represents light output. In the optical output-time characteristic diagram, the first state that the optical output is bright at the start of fade-out
And the second coordinate in which the light output is dark at the end of the fade-out and the light output is finished, and the fade-out is performed according to a curve bulging upward from a straight line passing through the first coordinate and the second coordinate. Discharge lamp lighting device characterized in that 3. A fade-in function for gradually increasing the light output of a discharge lamp from a dark state to a bright state with time, and a fade-out function for gradually decreasing the light output of the discharge lamp from a bright state to a dark state with time. In a discharge lamp lighting device having a function, on a light output-time characteristic chart in which time is plotted on the horizontal axis and light output is plotted on the vertical axis, a first state in which the light output is in a dark state at the start of fade-in Second at the end of coordinates and fade-in and when the light output is bright
Fade-in is performed according to a curve that bulges downward from a straight line that connects the coordinates of and that passes through the first coordinate and the second coordinate, and at the start of fade-out on the light output-time characteristic diagram, and The light output connects the third coordinate in the bright state with the fourth coordinate at the end of the fade-out and the light output in the dark state, and is directed upward from a straight line passing through the third coordinate and the fourth coordinate. A discharge lamp lighting device characterized in that fade-out is performed according to a bulging curve. 4. A fade-in function for gradually increasing the light output of the discharge lamp from a dark state to a bright state with time, and a fade-out function for gradually decreasing the light output of the discharge lamp from a bright state to a dark state with time. In a discharge lamp lighting device having a function, on a light output-time characteristic chart in which time is plotted on the horizontal axis and light output is plotted on the vertical axis, a first state in which the light output is in a dark state at the start of fade-in Second at the end of coordinates and fade-in and when the light output is bright
Fade-in is performed according to a curve that bulges downward from a straight line that connects the coordinates of and that passes through the first coordinate and the second coordinate, and at the start of fade-out on the light output-time characteristic diagram, and A discharge lamp lighting device, characterized in that a fade-out is performed according to a straight line connecting a third coordinate where the light output is in the bright state and a fourth coordinate where the light output is at the end of the fade-out and where the light output is in the dark state. 5. A fade-in function for gradually increasing the light output of a discharge lamp from a dark state to a bright state with time, and a fade-out function for gradually decreasing the light output of the discharge lamp from a bright state to a dark state with time. In a discharge lamp lighting device having a function, on a light output-time characteristic chart in which time is plotted on the horizontal axis and light output is plotted on the vertical axis, a first state in which the light output is in a dark state at the start of fade-in Second at the end of coordinates and fade-in and when the light output is bright
Fade-in is performed according to the straight line connecting with the coordinates, and in the light output-time characteristic diagram, the third coordinate when the fade-out starts and the light output is in the bright state and the fade-out end when the light output is in the dark state are shown. The discharge lamp lighting device is characterized in that the fade-out is performed in accordance with a curve which is connected to the coordinates of No. 4 and bulges upward from a straight line passing through the third coordinates and the fourth coordinates.