JPH06249572A - Lighting device of low temperature show case - Google Patents

Abstract

PURPOSE:To provide a uniform brightness within a show case by a method wherein an intensity of illumination of a illumination lamp at a top part arranged at the top part of the show case is set to be higher as compared with that of an illumination lamp at a shelf installed at a lower surface of each of the shelves. CONSTITUTION:An impedance of a choke coil connected to a shelf illumination lamp 26A of the upper-most shelf 25A is set to be higher than that of a choke coil connected to a fluorescent lamp 26 of a shelf. Accordingly, an intensity of illumination of the fluorescent lamp 26A of the shelf becomes lower as compared with that of the fluorescent lamp 26 at the shelf. Since a distance between the fluorescent lamp 26A of the shelf and the lower shelf 25B is shorter as compared with a distance between the fluorescent lamp 26 at the shelf and the lower shelf 25 or a bottom plate 19, brightness over the shelf or over a bottom plate shows a substantial same brightness as that of the shelf 25B at the third step from the bottom shelf and the shelf 25 below it or the bottom plate 19. Impedance of the choke coil connected to the fluorescent lamp 27 at the top part is set to be lower than that of another choke coil. Accordingly, an intensity of illumination of the fluorescent lamp 27 at the top part becomes remarkably higher as compared with intensities of illumination of the fluorescent lamps 26, 26A of the shelf.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a low temperature showcase in which a plurality of shelves are erected in a refrigerator and each shelf is provided with an illumination lamp.

[0002]

2. Description of the Related Art Conventionally, in a low temperature showcase of this kind, especially in a so-called open showcase, for example
As disclosed in Japanese Patent Publication No. 38227 (F25D23 / 00), a plurality of shelves are provided in the cabinet, and products such as foods are displayed on the shelves and can be exhibited and sold while being cooled and stored. Further, in order to improve the effect of displaying the products in the refrigerator, the shelves can be vertically moved and the angles thereof can be adjusted according to the type, amount, size, etc. of the products by the brackets that are detachably engaged with the columns. ing.

Further, in order to improve the customer's willingness to purchase products, fluorescent lights are provided on the lower surfaces of the shelves to brightly illuminate the products on the shelves facing below.
As for the uppermost shelf, a fluorescent lamp was provided in the top of the refrigerator to illuminate the products on the uppermost shelf.

[0004]

However, considering the visibility and the ease of taking out the product, the uppermost shelf cannot be made too high. Therefore, the fluorescent lamp at the top and the uppermost shelf below the fluorescent lamp. The distance between and is inevitably longer than the distance between the fluorescent lamp on the lower surface of the shelf and the shelf facing below. The longer the distance between the shelf and the fluorescent lamp, the lower the brightness on the upper surface of the shelf.Therefore, when using the fluorescent lamp of the same illuminance, the uppermost shelf is inevitable when the inside of the cabinet is viewed from the front. It will be darker than the lower shelf.

In particular, since there is a cool air discharge port near the fluorescent lamp on the ceiling, the temperature tends to be lower than that of other fluorescent lamps. Since the illuminance is reduced, the uppermost shelf is more likely to be darker than other shelves, which causes uneven brightness at the top and bottom of the refrigerator, which impairs the product appeal effect.

[0006] In recent years, in order to make it easier for customers to see the products on the shelves from the front and to improve the display effect of the products, the upper shelf is tilted lower and the front end is retracted. As a specification, a shelf installation form has come to be adopted, and in such a form, the distance between the shelves is not uniform, and the uppermost shelf is closest to the lower shelf. Therefore, since the fluorescent lamp on the lower surface of the uppermost shelf is closest to the lower shelf, the second upper shelf is brighter than the other shelves. In this way, there is a difference in brightness between the shelves, and uneven brightness occurs in the refrigerator.
Similarly, there was a problem that the product appeal effect was impaired.

The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide a lighting device for a low-temperature showcase capable of achieving uniform brightness in a refrigerator. And

[0008]

That is, the illuminating device 2 according to the invention of claim 1 has a plurality of shelves 25 erected in the interior 6, and
A low temperature showcase 1 including a shelf illumination lamp (shelf fluorescent lamp) 26 provided on the lower surface of each shelf 25 and a ceiling illumination lamp (top fluorescent lamp) 27 provided on the top of the interior of the cabinet 6. The illuminance of the ceiling illumination lamp (top fluorescent lamp) 27 adopted is higher than that of the shelf illumination lamp (shelf fluorescent lamp) 26.

The lighting device 2 according to the second aspect of the present invention includes shelves 25 which are vertically stacked in a cabinet 6 and lighting lamps (shelf fluorescent lamps) 26 provided on the lower surfaces of the shelves 25, respectively. The illuminance of the illuminating lamp (shelf fluorescent lamp) 26, which is adopted in the low temperature showcase 1 provided and has a long distance as compared with the illuminance of the illuminating lamp (shelf fluorescent lamp) 26A which is short in distance to the shelf 25B facing downward. It is an expensive one.

Further, in the illuminating device 2 of the third aspect of the present invention, a plurality of shelves 25 are installed in the compartment 6, a shelf fluorescent lamp 26 provided on the lower surface of each shelf 25, and a ceiling 6 in the compartment. Fluorescent lamps 27 provided in the upper part, a shelf fluorescent lamp heat insulating cover 42 provided around the shelf fluorescent lamps 26, and a ceiling fluorescent lamp heat insulating cover provided around the ceiling fluorescent lamps 27. 41, which is adopted in the low temperature showcase 1 provided with 41, and is compared with the shelf fluorescent lamp heat insulating cover 42.
It is a larger diameter.

[0011]

According to the illuminating device 2 of the low temperature showcase 1 of the invention of claim 1, as compared with the shelf illuminating lamp (shelf fluorescent lamp) 26 provided on the lower surface of the shelf 25, the illuminating device 2 is provided at the top of the inside of the refrigerator. Since the illuminance of the top illumination lamp (top fluorescent lamp) 27 is increased, the brightness of the uppermost shelf 25A having a long distance from the top top illumination lamp (top fluorescent lamp) 27 increases. . Therefore, the brightness of the shelf lighting lamp (shelf fluorescent lamp) 26 and the brightness of the shelf 25 therebelow are equalized, whereby the brightness of the interior 6 is uniformized.

Further, according to the lighting device 2 of the low temperature showcase 1 of the invention of claim 2, among the lighting lamps (shelf fluorescent lamps) 26 provided on the lower surface of the shelves 25 in a plurality of stages, shelves facing downward. Since the illuminance of the illuminating lamp (shelf fluorescent lamp) 26 having a long distance compared to the illuminance of the illuminating lamp (shelf fluorescent lamp) 26A having a short distance from 25B is increased, the shelf 25 is changed by changing the erection form of the shelf 25.
Even if the distance between them fluctuates, the brightness on the shelves 25 is made uniform, so that the brightness of the interior 6 is made uniform.

Further, according to the lighting device 2 of the low temperature showcase 1 of the invention of claim 3, as compared with the shelf fluorescent lamp heat insulating cover 42 around the shelf fluorescent lamp 26 provided on the lower surface of the shelf 25, Since the diameter of the ceiling fluorescent lamp heat insulating cover 41 around the ceiling fluorescent lamps 27 provided on the six ceilings in the compartment is increased, the air layer around the ceiling fluorescent lamps 27 is the air layer around the shelf fluorescent lamps 26. As a result, the heat insulation effect of the top fluorescent lamp 27 is improved, and the surface temperature of the top fluorescent lamp 27 is higher than that of the shelf fluorescent lamp 2.
6 is higher than the surface temperature. Since the illuminance of the fluorescent lamp increases as the surface temperature increases, the brightness of the uppermost shelf 25A having a long distance from the upper fluorescent lamp 27 increases. Therefore, the brightness of the shelf 25 below the shelf fluorescent lamp 26 is equalized, and the brightness of the interior 6 is thereby uniformized.

In particular, in this case, the same fluorescent lamp can be used for the top fluorescent lamp 27 and the shelf fluorescent lamp 26, and the heat insulating cover 41 for the top fluorescent lamp is located at the 6 tops of the refrigerator. Therefore, even if the diameter is increased, it does not interfere with the delivery of the product and no problem occurs.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an electric circuit diagram of a lighting device 2 of a low temperature showcase 1 of the present invention, and FIG. 2 is a schematic vertical sectional side view of the low temperature showcase 1. In FIG. 2, the low temperature showcase 1 is what is called an open showcase, and by attaching unillustrated side walls to both sides of the heat insulating wall 3 having a U-shaped cross section, an opening 4 is formed in the front surface inside the heat insulating wall 3. The inside 6 having the inside is configured. Inside the heat insulating wall 3, a partition plate 7 located at the back of the interior 6 and a partition plate 8 provided at a predetermined interval from the partition plate 7 constitute ducts 9 and 11 of two layers of inside and outside, and the opening 4 Discharge ports 12, 13 opening above and below the
And the suction ports 14 and 16 respectively.

In the inside duct 9, a cooler 17 included in a cooling device (not shown) is vertically installed.
Below the bottom plate 19 of the inside 18, a blower 21 is arranged at a position communicating with both ducts 9 and 11. This blower 21
Is operated, the cool air that has exchanged heat with the cooler 17 and is cooled goes up the duct 9, is blown from the discharge port 12 to the opening 4, and is sucked from the suction port 14. Also, the duct 11
The air inside rises there, is blown out from the discharge port 13 to the opening 4, and is sucked in from the suction port 16. By such circulation, two layers of inner and outer air curtains are formed in the opening 4, and a part of the cool air curtain on the inner side is drawn into the chamber 6 by the Counder effect and circulates, whereby the chamber 6 is heated to 0 ° C., for example. Cooling is maintained in the ice temperature zone of -3 ° C.

A column 23 is mounted on the partition plate 7 located at the back of the inside 6 of the compartment, and a plurality of brackets 24 are attached to the column 23 by detachably engaging them.
As a result, for example, the upper and lower shelves 2 are provided in the interior 6 above the bottom plate 19.
5 ... is erected. On the lower surface of the front part of each shelf 25, a shelf fluorescent lamp 26 as a shelf illumination lamp is attached across the left and right. Further, a top fluorescent lamp 27 as a top illumination lamp is attached to the left and right on the top surface of the partition plate 7 located on the ceiling of the interior 6 behind the discharge port 12. Further, on the inner surface of the canopy 28 that extends forward from the top surface of the heat insulating wall 3 in the form of an eaves, a plurality of outside fluorescent lamps 29 are attached to the left and right.

Each of the shelves 25 ... Has a so-called "hinatan" erection form in which the front portion of the upper shelves 25 is inclined lower by the bracket 24 and the front end is retracted.
As a result, the distance between the uppermost shelf 25A and the lower shelf 25B is shorter than the distance between the shelves 25 below the third shelf 25B from the bottom or the distance between the shelf 25 and the bottom plate 19. Has become. Therefore, the distance between the shelf fluorescent lamp 26A on the lower surface of the uppermost shelf 25A and the shelf 25B below it is shorter than the distance between the other shelf fluorescent lamps 26 and the shelf 25 or the bottom plate 19 below it. . Further, since the front part of the uppermost shelf 25A is inclined low, the distance between the ceiling fluorescent lamp 27 and the uppermost shelf 25A below the upper fluorescent lamp 27 is smaller than that of the shelf fluorescent lamp 26 and the lower shelf 25 or the bottom plate. It is assumed to be considerably longer than the distance from 19.

Next, in the electric circuit of the illuminating device 2 shown in FIG. 1, 2A indicates an internal lighting circuit section and 2B indicates an external lighting circuit section. An inverter oscillator 33 is connected to the commercial AC power supply AC via an internal fluorescent lamp switch 31 and a power factor improving reactor 32. The inverter oscillator 33 generates and outputs a high frequency voltage from the power supply AC, and the shelf fluorescent lamps 26, 26A and the ceiling fluorescent lamp 27 are connected in parallel to the output. Also,
It is assumed that the shelf fluorescent lamps 26, 26A and the ceiling fluorescent lamp 27 are the same fluorescent lamp in the embodiment.

Each shelf fluorescent lamp 26, 26A and top fluorescent lamp 2
A lighting capacitor 36 is connected to each of the lamps 7, a choke coil L1 for limiting the current is further connected to the top fluorescent lamp 27, and a shelf fluorescent lamp 2 on the lower surface of the uppermost shelf 25A.
6A has a choke coil L2, and another shelf fluorescent lamp 2
A choke coil L3 is connected to 6 in series. In the embodiment, the impedance of the choke coil L1 is smaller than the impedances of the other choke coils L2 and L3, and the impedance of the choke coil L2 is set larger than the impedance of the choke coil L3.

Further, the commercial AC power source AC is connected to the outside fluorescent lamps 29 via the outside fluorescent lamp switches 37, and a ballast 38 is connected in series to each outside fluorescent lamp 29, and , And the glow starters 39 are connected in parallel.

When the outside-compartment fluorescent lamp switch 37 is closed in the above-mentioned configuration, the outside-compartment fluorescent lamp 29 is energized via the ballast 38, and the glow starter 39 turns on the outside-compartment fluorescent lamp 29. When the inside fluorescent lamp switch 31 is closed, power is supplied to the inverter oscillator 33 via the reactor 32, and the inverter oscillator 33 outputs a high frequency voltage to the shelf fluorescent lamps 26, 26A and the top fluorescent lamp 27. As they are applied, they light up.

Here, the shelf fluorescent lamp 26 of the uppermost shelf 25A
The impedance of the choke coil L2 connected to A is equal to the impedance of the choke coil L3 connected to another shelf fluorescent lamp 26.
Since it is set to be larger than that of the shelf fluorescent lamp 26A, the current value of the shelf fluorescent lamp 26A is smaller than that of the other shelf fluorescent lamps 26. Therefore, the illuminance of the shelf fluorescent lamp 26A is lower than that of the other shelf fluorescent lamps 26. However, as described above, the distance between the shelf fluorescent lamp 26A and the shelf 25B below the shelf fluorescent lamp 26A is shorter than the distance between the other shelf fluorescent lamps 26 and the shelf 25 or the bottom plate 19 below the shelf fluorescent lamp 26A. Or, as the brightness on the bottom plate, the third shelf 25B from the bottom
And the shelf 25 or the bottom plate 19 therebelow are substantially the same.

The impedance of the choke coil L1 connected to the ceiling fluorescent lamp 27 is the same as that of the other choke coil L1.
2, because it is smaller than L3, the top fluorescent lamp 27
The current value applied to the rack fluorescent lamps 26, 26A is greater than the current value applied to the shelf fluorescent lamps 26, 26A. Therefore, the top fluorescent light 27
Is higher than the illuminances of the shelf fluorescent lamps 26 and 26A, but as described above, the distance between the top fluorescent lamp 27 and the uppermost shelf 25A below the shelf fluorescent lamps 26 and 26A is lower than that. Is longer than the shelves 25, 25B or the bottom plate 19, and the top fluorescent lamp 27 is in the vicinity of the discharge port 12 and its surface temperature tends to lower. The upper brightness is substantially the same for the uppermost shelf 25A and the lower shelves 25 and 25B or the bottom plate 19.

As described above, according to the lighting device 2 of the present invention,
Each shelf 2 illuminated by each fluorescent lamp 26, 27, 26A
Since the brightness of 5, 25A, 25B and the bottom plate 19 are equalized, the brightness of the entire interior 6 of the showcase 1 is also equalized. Therefore, it is possible to improve the product appeal effect without giving the customer a feeling of strangeness due to uneven brightness.

In the above invention, the choke coil L is used.
By changing the impedances of L1, L2, and L3, the illuminance was adjusted by providing a difference in the energization currents of the shelf fluorescent lamps 26, 26A and the top fluorescent lamp 27.
Illuminance adjustment may be performed by a heat insulating cover provided around 6, 26A and the top fluorescent lamp 27. In this case, it is assumed that the impedances of the choke coils L1 and L3 are the same and the current values supplied to the top fluorescent lamp 27 and the shelf fluorescent lamp 26 are the same.

That is, FIG. 3 shows a vertical side view of the ceiling fluorescent lamp 27 in this case, and FIG. 4 shows a vertical side view of the shelf fluorescent lamp 26 (including 26A). In both figures, a ceiling fluorescent lamp heat-insulating cover 41 made of a translucent hard synthetic resin is provided around the ceiling fluorescent lamp 27, and a shelf fluorescent lamp thermal insulator of the same material is provided around the shelf fluorescent lamp 26. A cover 42 is provided. The heat insulating covers 41 and 42 are provided to heat the fluorescent lamps 27 and 26 (because the illuminance is lowered by cooling as described above), to prevent the fluorescent lamps 27 and 26 from being damaged, and to absorb the ultraviolet rays emitted from them. It is what is done.

Further, the diameter of the ceiling fluorescent lamp heat insulating cover 41 is, for example, 43 mm, and the diameter of the shelf fluorescent lamp thermal insulating cover 42 is, for example, 38 mm. The diameter of the cover 41 is increased. As a result, the width of the air layer 43 between the top fluorescent lamp 27 and the heat insulating cover 41 for the top fluorescent lamp is equal to the width of the shelf fluorescent lamp 26.
And the width of the air layer 44 between the shelf fluorescent lamp heat-insulating cover 42 becomes thicker. Here, the air layers 43 and 44 serve as a heat insulating space, and serve to keep the top fluorescent lamp 27 or the shelf fluorescent lamp 26 warm from the cold air around the heat insulating cover 41 for the top fluorescent lamp or the heat insulating cover 42 for the shelf fluorescent lamp. However, the heat insulating effect of the thick air layer 43 is larger than that of the air layer 44.

Therefore, as described above, even if the ceiling fluorescent lamp 27 is near the discharge port 12 and is cooled more strongly than the shelf fluorescent lamp 26, the ceiling fluorescent lamp surrounded by the air layer 43 having a large heat insulating effect. The surface temperature of 27 is higher than the surface temperature of the shelf fluorescent lamp 26 surrounded by the air layer 44. Here, the higher the surface temperature of this type of fluorescent lamp becomes, the brighter it becomes, and the luminous efficiency becomes highest at about + 40 ° C. Therefore, by making the ceiling fluorescent lamp cover 41 thick as described above, the luminous efficiency of the ceiling fluorescent lamp 27 becomes higher than that of the shelf fluorescent lamps 26, 26A, and the illuminance thereof is equal to that of the shelf fluorescent lamps 26, 26A. Although it is higher than the above, the distance between the ceiling fluorescent lamp 27 and the uppermost shelf 25A below it is the distance between the shelf fluorescent lamps 26 and 26A and the lower shelves 25 and 25B or the bottom plate 19 as described above. Since it is longer in comparison, the brightness on the shelf or the bottom plate can be substantially the same for the uppermost shelf 25A and the lower shelves 25, 25B or the bottom plate 19.

In this case, the heat insulation cover 4 for the top fluorescent lamp is also used.
Since the diameter of 1 is large, the projecting dimension toward the inside 6 of the refrigerator is also relatively large, but the heat insulating cover 41 for the ceiling fluorescent lamp is not included in the shelf 2
Since it is located not on the lower surface of 5 but on the ceiling of the interior 6, there is no inconvenience that may interfere with the delivery of products.

In the above embodiment, each fluorescent lamp 26, 26
By changing the energizing current to A and 27, or
Although the illuminance of the heat insulating covers 41 and 42 is adjusted by changing the diameters thereof, the present invention is not limited to this. For example, a fluorescent lamp having a larger capacity than the shelf fluorescent lamps 26 and 26A may be used as the ceiling fluorescent lamp 27. Alternatively, the number of top fluorescent lamps 27 may be increased to cope with the problem. In addition, claim 1
In the invention of claim 2, various kinds of illumination other than the fluorescent lamp may be used as the illumination lamp.

[0032]

As described above in detail, according to the invention of claim 1, the illuminance of the top illumination lamp provided on the top of the refrigerator is higher than that of the shelf illumination lamp provided on the lower surface of the shelf. Therefore, it is possible to increase the brightness of the uppermost shelf that has a long distance from the upper ceiling lighting compared to the conventional one, and thus the brightness of the lower shelf by the shelf lighting is even. Be promoted.
Therefore, it is possible to make the brightness in the refrigerator uniform, eliminate the discomfort given to the customer, and improve the product appeal effect.

Further, according to the invention of claim 2, among the illumination lamps provided on the lower surface of the plurality of shelves, the distance between the illumination lamps having a shorter distance to the shelf facing downward is longer than that of the illumination lamp. Since the illuminance of the illuminating lamp is increased, even if the distance between the shelves changes due to a change in the shelf installation form, the brightness on each shelf can be equalized. Therefore, similarly, it is possible to uniformize the brightness in the refrigerator to eliminate the discomfort felt by the customer and improve the product appeal effect.

Further, according to the invention of claim 3, since the diameter of the heat insulating cover for the top fluorescent lamp is larger than that of the heat insulating cover for the shelf fluorescent lamp, the heat insulating effect of the top fluorescent lamp is improved.
The surface temperature of the top fluorescent lamp becomes higher than that of the shelf fluorescent lamp. As a result, the illuminance of the top fluorescent lamp can be made higher than that of the shelf fluorescent lamp, and the brightness of the uppermost shelf with a long distance from the upper fluorescent lamp is improved compared to the conventional one. Therefore, the brightness on each shelf can be equalized. Therefore, similarly, it is possible to uniformize the brightness in the refrigerator to eliminate a sense of discomfort given to the customer and improve the product appeal effect.

In particular, in this case, since the same fluorescent lamp can be used for the ceiling fluorescent lamp and the shelf fluorescent lamp, the manufacturing cost can be reduced and the parts management can be facilitated. Since the heat-insulating cover for the partial fluorescent lamp is located at the top of the inside of the refrigerator, it has an effect that even if its diameter is increased, it does not hinder the delivery of the product.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a lighting device for a low temperature showcase according to the present invention.

FIG. 2 is a schematic vertical sectional side view of a low temperature showcase.

FIG. 3 is a vertical sectional side view of a ceiling fluorescent lamp and a heat insulating cover for the ceiling fluorescent lamp.

FIG. 4 is a vertical sectional side view of a shelf fluorescent lamp and a heat insulating cover for the shelf fluorescent lamp.

[Explanation of symbols]

 1 Low-temperature showcase 2 Lighting device 6 In-house 25 Shelf 26 Shelf fluorescent light 27 Top fluorescent lamp 41 Heat insulating cover for top fluorescent lamp 42 Heat insulating cover for shelf fluorescent lamp L1 Choke coil L2 Choke coil L3 Choke coil

Claims (3)

[Claims] 1. A low temperature show comprising a plurality of shelves erected in a cabinet, shelf illuminators respectively provided on the lower surfaces of the shelves, and a ceiling illuminator provided at the top of the cabinet. In the case, the illumination device of the low temperature showcase is characterized in that the illuminance of the top illumination light is higher than that of the shelf illumination light. 2. A low-temperature showcase comprising a plurality of shelves vertically arranged in a cabinet and lighting lamps provided on the lower surfaces of the shelves, wherein the lighting lamps having a short distance from the shelves facing downward. The illumination device for a low-temperature showcase is characterized in that the illuminance of the illuminating lamp having the long distance is increased as compared with the illuminance of the above. 3. A plurality of shelves erected in the cabinet, shelf fluorescent lamps respectively provided on the lower surfaces of the shelves, a ceiling fluorescent lamp provided on the top of the cabinet, and the shelf fluorescent lamps. In a low temperature showcase having a shelf fluorescent lamp thermal insulation cover provided around each of the above, and a ceiling fluorescent lamp thermal insulation cover provided around the ceiling fluorescent lamp, in the shelf fluorescent lamp thermal insulation cover A lighting device for a low-temperature showcase, characterized in that the diameter of the heat insulation cover for the top fluorescent lamp is increased in comparison.