CN109237861B

CN109237861B - Interior lighting device, refrigerator and freezer

Info

Publication number: CN109237861B
Application number: CN201810599139.0A
Authority: CN
Inventors: 阪口知久; 福井厚司
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2017-07-10
Filing date: 2018-06-11
Publication date: 2021-10-19
Anticipated expiration: 2038-06-11
Also published as: TWI740032B; CN109237861A; TW201908677A; JP2019016545A; JP6832543B2

Abstract

Provided is an interior lighting device capable of improving the visibility of stored articles. The interior lighting device comprises a plurality of light emitting elements arranged in an inner width direction (X), and a cover covering the light emitting elements, wherein the cover is provided with a plurality of lenses (12) for controlling light distribution of light irradiated from the light emitting elements in a plurality of directions, and the irradiated light has an irradiation distribution (13) having a stronger light irradiation peak value on an inner wall surface than a central part in the inner width direction, so that the interior lighting device not only can brighten the whole interior, but also can improve the visibility of the interior storage product compared with the prior art.

Description

Interior lighting device, refrigerator and freezer

Technical Field

The present invention relates to an interior lighting device provided in a refrigerator or the like.

Background

In a conventional refrigerator, a plurality of interior illumination devices having different light irradiation directions are provided in order to brightly illuminate the entire interior to improve visibility of a user inside.

Patent document 1 describes an interior lighting device shown in fig. 8.

Fig. 8 shows a sectional view in the depth direction (Z-axis direction) of the refrigerator. A refrigerating chamber door is shown at 18, and the inside is shown at 19. The interior illumination means 20 is arranged on the top surface 21 of the interior. The interior lighting device 20 including a plurality of lighting devices includes a front-row mounting substrate 22 on which light emitting diodes (hereinafter, referred to as LEDs) are mounted and a rear-row mounting substrate 23. The front-row mounting board 22 irradiates light to the front of the internal shelf 24 and the pocket (pocket)25, and the rear-row mounting board 23 irradiates the rearmost of the first stage of the internal shelf 24. And 26 is a pipe.

Prior art documents

Patent document

Patent document 1: japanese patent No. 5124538

Disclosure of Invention

In the conventional interior lighting device, the rear row mounting board 23 on which the LEDs are mounted is mounted obliquely toward the rear surface of the interior 19 to improve the visibility of the food, but the visibility of the food disposed on the rear portion of the interior shelf is low because the light hardly reaches the uppermost rear wall portion 27 of the interior 19.

Further, although the light distribution is controlled in the depth direction of the inside, the control in the inner width direction (X-axis direction) is not performed, and the light is uniformly diffused, so that both end portions of the inside are distant from the LED, and the light is hard to reach and is darker than the center portion of the inside.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide an interior lighting device capable of improving visibility of stored articles at both ends of the interior as compared with the conventional one.

In order to achieve the above object, an interior lighting device according to the present invention is an interior lighting device that is provided on a top surface of an interior and illuminates the interior, the interior lighting device including a plurality of light emitting elements in which the plurality of light emitting elements are arranged in a width direction of the interior, and a cover that covers the light emitting elements, the cover including a plurality of lenses that control light distribution of light emitted from the plurality of light emitting elements in a plurality of directions, the light emitted from the interior lighting device having an emission distribution in which an emission peak of the light is stronger toward a wall surface of the interior than a center portion in the width direction of the interior.

Moreover, it is characterized in that: the lens is configured such that, in order to control the distribution of light emitted from the light emitting element, the center of a curved surface on the emission surface side of the lens is eccentric with respect to an axis that is perpendicular to the light emitting surface of the light emitting element and passes through the center.

Moreover, it is characterized in that: the plurality of lenses are different in shape in order to control light distribution of light emitted from the light emitting element in a plurality of directions.

Moreover, it is characterized in that: in order to control light distribution of light emitted from the light emitting element in a plurality of directions, in each lens, the center of a curved surface on the emission surface side of the lens is eccentric with respect to an axis perpendicular to the light emitting surface of the light emitting element and passing through the center, and the eccentricity of the lens is larger in the width direction of the interior than in the ends of the lens in the width direction of the center.

Moreover, it is characterized in that: the plurality of lenses are lenses each of which is a combination of curves having two curvatures whose ends are continuous, in order to control light distribution of light emitted from the light emitting element in a plurality of directions.

Effects of the invention

According to this configuration, since the light distribution control of the lens provided in the cover causes the irradiated light to have an irradiation distribution in which the irradiation peak of the light is stronger on the inner wall surface than on the central portion in the width direction of the interior, the light can be reflected by the wall surface to illuminate both end portions of the interior while uniformly illuminating the inner wall surface, and the visibility of the storage items at both end portions of the interior can be improved.

Drawings

Fig. 1 is a sectional view in a depth direction of a refrigerator including an interior lighting device according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the inside of the refrigerator in this embodiment in the width direction.

Fig. 3 is a plan view of (a) a main part of the top surface of the inside and (b) a sectional view in this embodiment.

Fig. 4 is an explanatory view (a) simply showing a lens group formed on the cover and (b) showing a light distribution angle in the depth direction inside thereof in the embodiment.

Fig. 5 is a sectional view (a) showing the lens shape 12a and a sectional view (b) showing the lens shape 12b in the embodiment of the present invention.

Fig. 6 is a sectional view (a) in the width direction of the refrigerator and (b) in the depth direction of the refrigerator showing an illumination state when food is put in the refrigerator provided with the interior illumination device 6 of the embodiment.

Fig. 7 is an explanatory view (a) of a comparative example, which simply shows a lens group formed on a cover, and (b) shows a light distribution angle in the depth direction inside the lens group.

Fig. 8 is a sectional view in a depth direction in a conventional refrigerator.

Detailed Description

Embodiments of the present invention will be described below with reference to fig. 1 to 7.

Fig. 1 to 6 (a) and (b) show an embodiment of the present invention. Fig. 7 (a) and (b) show a comparative example.

Fig. 1 shows a sectional view of the refrigerator 1 in a depth direction (Z-axis direction), and fig. 2 shows a sectional view of the refrigerator 1 in a width direction (X-axis direction). A refrigerating chamber door is shown at 2, and the inside is shown at 3. The top surface 4 and the side surfaces 5 of the inner portion 3 are made of a white resin material, and therefore have a characteristic of reflecting and diffusing light. An interior illumination device 6 for illuminating the entire interior 3 is provided on the top surface 4. In the interior 3,

storage shelves

7a, 7b, 7c, and 7d made of a transparent resin material are provided, and in a state where food is not stored in the storage shelves 7a to 7d, light from the interior illumination device 6 is transmitted from the interior upper surface toward the interior lower surface through the storage shelves 7a to 7 d. The inner rear surface 8 is also made of white resin, similarly to the top surface 4 and the side surfaces 5, and therefore has a property of reflecting light.

When the irradiation light R1 irradiated from the interior lighting device 6 in the depth direction (Z-axis direction) of the interior is irradiated to the entire interior as shown in fig. 1 and the food items are stored in the storage shelves 7a to 7d, the food items are irradiated with the light reflected by the top surface 4, the side surfaces 5, and the back surface 8 in addition to the light directly irradiated, thereby improving the visibility of the food items.

The irradiation light R2 irradiated from the interior lighting device 6 in the width direction (X-axis direction) of the interior irradiates the entire interior as shown in fig. 2. In order to improve the visibility of the food items stored in the storage shelves 7a to 7d, light directly irradiated to the food items is required, but in addition, the visibility of the food items can be further improved by the human feeling of brightness throughout the inside. Therefore, it is necessary to uniformly brighten all of the inner top surface 4, side surfaces 5, and back surface 8. Therefore, the interior illumination device 6 needs to control the light distribution of the entire interior, but simply diffusing the light distribution reduces the light efficiency, and therefore, needs to control the light distribution in accordance with the shape of the interior.

As shown in fig. 3 (a) and (b) to fig. 5, the interior lighting device 6 is configured.

As shown in fig. 3 (a) (b), the interior illumination device 6 includes: an LED mounting substrate 10 on which an LED group 9 as a light emitting element is mounted in the X-axis direction at a predetermined pitch; and a top surface cover 11 interposed between the LED mounting substrate 10 and the interior 3.

Specifically, 14 LEDs 9 are mounted on the LED mounting board 10₁～9₁₄And LED9₁～9₁₄Correspondingly atThe top cover 11 is integrally resin-molded with a lens 12 in the X-axis direction₁～12₁₄The lens group 12 is formed. The top cover 11 is made of a transparent resin material. The material is polystyrene. With pairs from LED9₁～9₁₄ Lens 12 for controlling light distribution₁～12₁₄The lens shapes are not all the same, and the lens shapes are different depending on the position in the X-axis direction. Specifically, in order to control the light distribution of the light emitted from the LED in a plurality of directions, each lens 12 is provided with a light distribution control unit₁～12₁₄In the lens, the center portion of the curved surface on the emission surface side of the lens is eccentric with respect to an axis perpendicular to the light emission surface of the LED and passing through the center portion, and the eccentricity amount of the lens is larger in the width direction (X-axis direction) of the inner portion 3 than in the center portion.

Fig. 4 (a) and (b) are diagrams simply illustrating the lens group 12 of the top cover 11, and LED9 corresponding to each lens is LED through each lens₁～9₁₄The light distribution of the light is controlled in the X-axis direction and the Z-axis direction.

Lens 12₁～12₃、12₁₂～12₁₄The light distribution control is performed in a direction diverging from the width direction (X-axis direction) of the refrigerator. This has the following effect: the back surface 8 and the side surfaces 5 of the internal shelf 7a of the first stage from top to bottom and the internal shelf 7b of the second stage from top to bottom in fig. 1 are irradiated with light, so that the regions of the refrigerator 1 that are difficult to reach by light in the structure are brightened. Here, as shown in fig. 4 (b), the lens 12₁～12₃The angle of the irradiation direction in the depth direction (Z-axis direction) of the refrigerator is larger than that of the lens 12₄～12₆、12₉～12₁₁. Lens 12₇、12₈The angle of the irradiation direction in the depth direction (Z-axis direction) of the refrigerator of (1) with respect to the lens 12₄～12₆、12₉～12₁₁Inclined in the depth direction (Z-axis direction) and inclined in the opposite, forward direction.

Lens 12₄～12₆、12₉～12₁₁An internal shelf 7c of the third stage and an internal shelf of the fourth stage from the topThe back surface 8 and the side surface 5 of the light source 7d are irradiated with light, and the light condensed by the lens is irradiated at a position farthest from the interior illumination device 6.

FIG. 5 (a) shows a lens 12₁～12₃、12₅、12₆、12₉、12₁₀、12₁₂～12₁₄The lens shape 12 a. The curved surface of the lens shape 12a is a curved surface on the emission side, and the center of the curved surface on the emission surface side of the lens is eccentric with respect to an optical axis a perpendicular to the light emission surfaces of the LEDs constituting the LED group 9 and passing through the center. This is an effective method when performing light distribution control in a specific direction when the mounting positions of the LED group 9 and the LED mounting substrate 10 are limited. R3 is refracted light.

FIG. 5 (b) shows the lens 12₄、12₇、12₈、12₁₁The lens shape 12 b. The lens shape 12b is a lens in which adjacent ends of two lenses are connected and a curve combining two curvatures is formed. The light from one LED can be irradiated in two directions by passing the light through the lens, and this is an effective method for diffusing the light from the LED.

Here, the lens 12₄、12₁₁The lens shape 12b distributes light in two directions, i.e., left and right ends in the width direction of the refrigerator, so as to spread the light in the entire width direction (X-axis direction) of the refrigerator. Here, when the lens group 12 is divided in the width direction symmetrically, the lens 12₄、12₁₁The lens group is located at the center of each lens group, and therefore has a characteristic of uniformly diffusing right and left diffusion. R4 is refracted light.

Further, the lens 12 in the center of the lens group 12₇、12₈The vector component is smaller than that of the other lenses, but has a component in the positive Z-axis direction, and light distribution control is performed in the forward direction of the interior 3 (positive Z-axis direction). Furthermore, the lens 12₇、12₈After the light is condensed, light distribution control is performed in the X-axis direction to perform irradiation so that light is not irradiated to the outside of the inside 3. Further, in order to make the diffusion in the entire width direction of the refrigerator, the lens 1 is constituted in a lens shape 12b2₇、12₈The light is distributed in two directions, namely the left end and the right end in the width direction of the refrigerator.

If each lens 12 is used₁～12₁₄The light distribution overlap of (a) is, as illustrated in fig. 4 (a), an irradiation distribution 13 having a stronger irradiation peak of light to the wall surface of the interior than the central portion in the width direction of the interior, and is a distribution having peaks in bilateral symmetry with respect to the central portion in the width direction of the refrigerator. Accordingly, not only the food items stored on the inner shelves 7a to 7d but also the top surface 4, the side surfaces 5, and the back surface 8 inside can be uniformly irradiated with light. Therefore, both end portions of the interior 3 become bright, and the visibility of food at both end portions of the interior 3 is improved.

The lighting state when the refrigerator 1 having the interior lighting device 6 stores food will be described in detail with reference to fig. 6 (a) and (b). 14 is a duct of the back surface 8 arranged inside.

The food 15 is stored in the inner rack 7a of the first stage from top to bottom in the inner portion on the front side (negative Z-axis direction). Food items 16 are stored on the back side (positive Z-axis direction) of the internal rack 7b on the second level from the top. The light ray R7 of the light irradiated by the interior illumination device 6, which is not blocked by the food 15, directly reaches the food 16 through the interior shelf 7 a. The light ray R6 blocked by the food item 15 cannot reach the food item 16.

The reflected light R5, which is illuminated by the interior lighting means 6 and reflected by the side 5, reaches the food 16.

Therefore, in the case where the food 15 is placed on the inner rack 7a of the first stage from the top, the reflected light R5 reflected by the side surface 5 and reaching the food 16 needs to be increased in order to improve the visibility of the food 16. For this purpose, the lens 12 from fig. 4 (a)₁～12₃And a lens 12₁₂～12₁₄The light distribution of the light beam is controlled in a direction of spreading in the width direction (X-axis direction) of the refrigerator.

In addition, when the visibility of food 15 and food 16 is further improved, it is effective to irradiate light from a plurality of directions, and for this reason, light is emitted from lens 12₄～12₆、12₉～12₁₁Light of (2)By irradiating from a plurality of directions, the visibility of food 15 and food 16 can be improved.

Fig. 7 (a) and (b) show a comparative example.

The shape of the lens group of the interior illumination device 6 of this comparative example is different from the embodiments shown in fig. 3 to 4 (a) and (b). In the comparative example of fig. 7 (a), the lens surface of 14 lenses is a single lens having the same decentering and curvature. Here, as shown in fig. 7 (b), the lens 12₁～12₁₄The angle of the irradiation direction in the depth direction (Z-axis direction) of the refrigerator (a) is the same.

In the case of this comparative example, the LED9 is provided by each lens pair₁～9₁₄If the lens 12 is controlled to perform light distribution control₁～12₁₄When the light distribution distributions (b) are superimposed, the irradiation distribution 17 shown in fig. 7 (a) is uniformly diffused in the width direction (X-axis direction) of the refrigerator. When the interior is illuminated in this way, light hardly reaches the side surface 5 of fig. 2, and therefore becomes dark. Therefore, the human feels dark throughout the inside, and it is difficult to improve the visibility of food.

In the above embodiment, the top cover 11 is described as one block with respect to the top surface 4, but may be divided into a plurality of blocks according to design, structural limitations, and the like.

In the above embodiment, although 14 lenses for distributing light are listed in total for the lens group 12 of the top cover 11, the number is not limited, and two types of

lens shapes

12a and 12b are listed for the shape of the lens, but light distribution can be formed in various combinations.

In fig. 5 (a) and (b) of the above embodiment, although the LED9 is used for the lens shape 12a and the lens shape 12b, a multi-chip type LED may be used for higher output.

In the above embodiment, the lens shapes 12a and 12b have been described such that the light emitting surface side is a convex shape and the light incident surface side is a concave shape, but either one may be a convex shape or a concave shape, and either one of the light incident surface and the light emitting surface may be a planar shape. Further, although the step is generated, in order to suppress the thickness of the lens, it may be in a fresnel lens shape.

In the above embodiment, polystyrene is used for the top cover 11, but polycarbonate, acrylic resin, or the like, which is a transparent resin, may be used.

In the above embodiment, the refrigerator 1 has a structure in which the rear surface 8 at the uppermost portion of the inside is narrowed in order to dispose the compressor at the upper portion of the refrigerator 1, but the present invention is not limited to this structure.

In the above embodiment, white resin is used for the top surface 4, the side surfaces 5, and the back surface 8 of the inner portion, but a member made of glass or stainless steel may be used to improve the reflectivity in order to provide a mirror surface in a part thereof in accordance with design or the like.

In the above embodiment, the case of the refrigerator in which the interior illumination device 6 is mounted on the top surface 4 inside has been described as an example, but the same applies to the case of the refrigerator in which the interior illumination device 6 is mounted on the top surface inside the refrigerator.

Industrial applicability

The invention can improve the visibility of the stored articles at the two inner ends compared with the prior art, facilitates the taking and placing of the stored articles, and is beneficial to the high functionality of various products such as refrigerators, freezers and the like.

Description of the symbols

1 refrigerator

2 refrigerating chamber door

3 inside

4 top surface of the inner part

5 inner side surface

6 interior lighting device

7a, 7b, 7c, 7d internal shelves

8 back of the interior

9 LED group

9₁～9₁₄ LED

10 LED mounting substrate

11 top cover

12 lens group

12₁～12₁₄Lens and lens assembly

13 irradiation distribution having strong light irradiation peak on inner wall surface

14 pipeline

15. 16 food product

17 light distribution of lens group of comparative example

Width direction of X inner part

The depth direction of the inside of Z.

Claims

1. An interior lighting device that is provided on a ceiling surface inside and illuminates the inside, the interior lighting device comprising:

a plurality of light emitting elements arranged in a row in a width direction of the interior; and

a cover covering the light emitting element,

the cover has a plurality of lenses for controlling light distribution of light emitted from the plurality of light emitting elements in a plurality of directions,

in order to control light distribution of light emitted from the light emitting element in a plurality of directions, in each lens, the center portion of a curved surface on the emission surface side of the lens is eccentric with respect to an axis perpendicular to the light emitting surface of the light emitting element and passing through the center portion, the lens is larger in eccentricity in the direction toward both end portions in the width direction than the lens in the center portion, and the lens is larger in angle in the irradiation direction in the depth direction than the lens in the center portion in the width direction,

the light emitted from the interior illumination device has an emission distribution having a stronger light emission peak toward the wall surface of the interior than the center portion in the width direction of the interior.

2. The interior illumination device of claim 1,

the plurality of lenses are lenses each of which is a combination of curves having two curvatures whose ends are continuous, in order to control light distribution of light emitted from the light emitting element in a plurality of directions.

3. A refrigerator provided with the interior illumination device according to claim 1 or 2.

4. An ice chest provided with the interior illumination device of claim 1 or 2.