Heater

Abstract

A heater 1 includes: a first bus bar 50; a second bus bar 60 disposed at an interval from the first bus bar 50 in a first direction X; a first conductive line 10 connecting the first bus bar 50 and the second bus bar 60 and extending in the first direction X; and a second conductive line 20 connecting the first bus bar 50 and the second bus bar 60 and extending in the first direction X. The first conductive line 10 and the second conductive line 20 are arranged side by side in a second direction Y intersecting the first direction X. A first length L1 of the first conductive line 10 is equal to a second length L2 of the second conductive line 20. A first shape C1 of the first conductive line 10 is different from a second shape C2 of the second conductive line 20.

Description

Heater

[0001] This disclosure relates to a heater.

[0002] The conductive film disclosed in Patent Document 1 is applied to a heater. This conductive film has a plurality of conductive portions and a plurality of openings. The combined shape of the conductive portion and the opening is a mesh shape. The conductive portion is formed in a mesh pattern having intersections of a plurality of grids formed by a plurality of conductive metal fine wires. Among the plurality of conductive metal fine wires, some metal fine wires are formed in a wavy shape in which there is at least one arc between intersections and the directions of the arcs are arranged alternately.

[0003] Japanese Patent Application Laid-Open No. 2010-3667

[0004] In the heater to which the conductive film disclosed in Patent Document 1 is applied, while the metal fine wires of the conductive portion being formed in a random wavy shape contributes to the suppression of glare, the wiring lengths of the metal fine wires of the conductive portion vary, resulting in thermal unevenness.

[0005] An object of the present disclosure is to provide a heater that achieves both suppression of glare and reduction of thermal unevenness.

[0006] The heater according to the present disclosure includes a first bus bar, a second bus bar arranged at an interval in a first direction with respect to the first bus bar, a first conductive wire connecting the first bus bar and the second bus bar and extending in the first direction, and a second conductive wire connecting the first bus bar and the second bus bar and extending in the first direction. The first conductive wire and the second conductive wire are arranged in a second direction intersecting the first direction, the first length of the first conductive wire is equal to the second length of the second conductive wire, and the first shape of the first conductive wire is different from the second shape of the second conductive wire.

[0007] According to the present disclosure, it is possible to provide a heater that achieves both suppression of glare and reduction of thermal unevenness.

[0008] Figure 1 shows an exploded perspective view of the heater according to the first embodiment. Figure 2 shows the conductive wire and busbar according to the first embodiment. Figure 3 shows the length and shape of the conductive wire according to the first embodiment. Figure 4 shows goggles to which the heater according to the second embodiment is applied.

[0009] Embodiments of the present disclosure will be described in detail below with reference to the drawings. The following description of preferred embodiments is illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses in any way.

[0010] <First Embodiment> The first embodiment will now be described. Figure 1 shows an exploded perspective view of the heater 1. In Figure 1, the front-to-back direction X, the left-to-right direction Y, and the up-and-down direction Z intersect (more specifically, are orthogonal) with each other. The front-to-back direction X intersects (more specifically, is orthogonal) with the left-to-right direction Y and the up-and-down direction Z. The left-to-right direction Y intersects (more specifically, is orthogonal) with the front-to-back direction X and the up-and-down direction Z. The up-and-down direction Z intersects (more specifically, is orthogonal) with the front-to-back direction X and the left-to-right direction Y. The front-to-back direction X is an example of a first direction. The left-to-right direction Y is an example of a second and third direction.

[0011] The heater 1 comprises a base material 2, an adhesive layer 3, wiring 4 (first conductive wire 10 and second conductive wire 20), redundant wiring 5 (third conductive wire 30 and fourth conductive wire 40), a first busbar 50, and a second busbar 60.

[0012] The base material 2 is plate-shaped with the vertical direction Z as the thickness direction. The base material 2 extends in the front-to-back direction X and the left-to-right direction Y. The base material 2 is transparent to visible light. The base material 2 is made of an insulator.

[0013] The adhesive layer 3 is plate-shaped with its thickness in the vertical direction Z. The adhesive layer 3 extends in the front-to-back direction X and the left-to-right direction Y. The adhesive layer 3 is transparent to visible light. The adhesive layer 3 is made of an insulator. The adhesive layer 3 is positioned above the substrate 2 at Za. The substrate 2 is positioned below the adhesive layer 3 at Zb. The adhesive layer 3 may also function as a cover.

[0014] The first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are arranged between the base material 2 and the adhesive layer 3 in the vertical direction Z. The first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are arranged above the base material 2 Za and below the adhesive layer 3 Zb. The first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are provided in grooves (not shown) provided on the upper surface 2a of the base material 2.

[0015] The first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are all made of a conductor. The first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are all made of metal.

[0016] The arrangement of the first busbar 50 and the second busbar 60 will be described later.

[0017] (Conductive wires and busbars) Figure 2 shows the wiring 4 (first conductive wire 10 and second conductive wire 20), redundant wiring 5 (third conductive wire 30 and fourth conductive wire 40), first busbar 50 and second busbar 60. Note that in Figure 2, these wires are shown larger than they actually are for clarity. Figure 2 shows the top surface 2a of the substrate 2.

[0018] The first bus bar 50 and the second bus bar 60 are positioned with a gap between them in the front-rear direction X. The first bus bar 50 is positioned with a gap between it and the second bus bar 60 in the front-rear direction X. The second bus bar 60 is positioned with a gap between it and the first bus bar 50 in the front-rear direction X. The first bus bar 50 is positioned Xa in front of the second bus bar 60. The second bus bar 60 is positioned Xb behind the first bus bar 50.

[0019] The first busbar 50 extends in the left-right direction Y. The second busbar 60 extends in the left-right direction Y. Both the first busbar 50 and the second busbar 60 are made of a conductive material. Both the first busbar 50 and the second busbar 60 are made of metal.

[0020] The first busbar 50 is connected to the positive terminal of the power supply P. The second busbar 60 is connected to the negative terminal of the power supply P. The power supply P is, for example, a battery.

[0021] Wiring 4 is a thin metal wire that directly connects the first busbar 50 and the second busbar 60. Wiring 4 includes a first conductive wire 10 and a second conductive wire 20. Heater 1 comprises the first conductive wire 10 and the second conductive wire 20.

[0022] The first conductive wire 10 is positioned between the first busbar 50 and the second busbar 60 in the front-rear direction X. The first conductive wire 10 extends in the front-rear direction X. The first conductive wire 10 connects the first busbar 50 and the second busbar 60.

[0023] The second conductive wire 20 is positioned between the first busbar 50 and the second busbar 60 in the front-rear direction X. The second conductive wire 20 extends in the front-rear direction X. The second conductive wire 20 connects the first busbar 50 and the second busbar 60.

[0024] The first conductive wire 10 and the second conductive wire 20 are spaced apart in the left-right direction Y. The first conductive wire 10 is positioned next to the second conductive wire 20 with a gap in the left-right direction Y. The second conductive wire 20 is positioned next to the first conductive wire 10 with a gap in the left-right direction Y. The first conductive wire 10 and the second conductive wire 20 are adjacent to each other in the left-right direction Y.

[0025] Wiring 4 is arranged in the left-right direction Y.

[0026] The redundant wiring 5 is a thin metal wire that intersects with wiring 4. The redundant wiring 5 includes a third conductive wire 30 and a fourth conductive wire 40. The heater 1 comprises the third conductive wire 30 and the fourth conductive wire 40.

[0027] The third conductive wire 30 extends in the left-right direction Y. The third conductive wire 30 connects the first conductive wire 10 and the second conductive wire 20.

[0028] The fourth conductive wire 40 extends in the left-right direction Y. The fourth conductive wire 40 connects the first conductive wire 10 and the second conductive wire 20.

[0029] The third conductive wire 30 and the fourth conductive wire 40 are spaced apart in the front-to-back direction X. The third conductive wire 30 is positioned next to the fourth conductive wire 40 with a gap between them in the front-to-back direction X. The fourth conductive wire 40 is positioned next to the third conductive wire 30 with a gap between them in the front-to-back direction X. The third conductive wire 30 and the fourth conductive wire 40 are adjacent to each other in the front-to-back direction X.

[0030] The redundant wiring 5 is arranged in the front-to-back direction X.

[0031] The third conductive wire 30 and the fourth conductive wire 40 are so-called redundant wires, and they serve as a bypass path for the current in the event that a portion of the first conductive wire 10 / second conductive wire 20 is cut.

[0032] Current flows from the power supply P through the first busbar 50 to the first conductive wire 10 and the second conductive wire 20, and returns to the power supply P through the second busbar 60. If the first conductive wire 10 / second conductive wire 20 is cut, current may flow through the third conductive wire 30 or the fourth conductive wire 40. Since the first conductive wire 10, the second conductive wire 20, the third conductive wire 30, and the fourth conductive wire 40 are resistors, they generate heat when current flows through them.

[0033] (Length and Shape of Conductive Wires) Figure 3 shows the length and shape of the first conductive wire 10 and the second conductive wire 20. The first conductive wire 10 extends in the front-rear direction X while vibrating in the left-right direction Y. The first conductive wire 10 has a periodic structure with a first amplitude A1 and a first period T1. The second conductive wire 20 extends in the front-rear direction X while vibrating in the left-right direction Y. The second conductive wire 20 has a periodic structure with a second amplitude A2 and a second period T2.

[0034] The first conductive wire 10 has a first length L1. The first length L1 is the total length of the first conductive wire 10, including any detours. The first length L1 is the length of the midline 10c between the first side 10a and the second side 10b of the first conductive wire 10. More specifically, the first length L1 is the straight line connecting the midpoint K1 of point I1 and point J1, where point I1 is the intersection of a straight line parallel to the first busbar 50 and the second busbar 60 with the first side 10a, and point J1 is the intersection of a straight line parallel to the first busbar 50 and the second busbar 60 with the second side 10b.

[0035] The second conductive wire 20 has a second length L2. The second length L2 is the total length of the second conductive wire 20, including the detour. The second length L2 is the length of the midpoint line 20e between the third side 20c and the fourth side 20d of the second conductive wire 20. More specifically, the second length L2 is the line connecting the midpoint K2 of point I2 and point J2, where point I2 is the intersection of a line parallel to the first busbar 50 and the second busbar 60 with the third side 20c, and point J2 is the intersection of a line parallel to the first busbar 50 and the second busbar 60 with the fourth side 20d.

[0036] The first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 are equal to each other. The first length L1 of the first conductive wire 10 is equal to the second length L2 of the second conductive wire 20. The second length L2 of the second conductive wire 20 is equal to the first length L1 of the first conductive wire 10. Here, "equal" means that an error of about 3% is acceptable.

[0037] The first shape C1 of the first conductive wire 10 is a sine wave. The second shape C2 of the second conductive wire 20 is a sine wave.

[0038] The first amplitude A1 of the first conductive wire 10 and the second amplitude A2 of the second conductive wire 20 are different from each other. The first amplitude A1 of the first conductive wire 10 is different from the second amplitude A2 of the second conductive wire 20. The second amplitude A2 of the second conductive wire 20 is different from the first amplitude A1 of the first conductive wire 10.

[0039] The first period T1 of the first conductive wire 10 and the second period T2 of the second conductive wire 20 are different from each other. The first period T1 of the first conductive wire 10 is different from the second period T2 of the second conductive wire 20. The second period T2 of the second conductive wire 20 is different from the first period T1 of the first conductive wire 10.

[0040] In this example, the first shape C1 is composed of a first amplitude A1 and a first period T1. The second shape C2 is composed of a second amplitude A2 and a second period T2.

[0041] The first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 are different from each other. The first shape C1 of the first conductive wire 10 is different from the second shape C2 of the second conductive wire 20. The second shape C2 of the second conductive wire 20 is different from the first shape C1 of the first conductive wire 10.

[0042] The first ratio A1 / T1 of the first amplitude A1 and the first period T1 in the first conductive wire 10 is equal to the second ratio A2 / T2 of the second amplitude A2 and the second period T2 in the second conductive wire 20. The first ratio A1 / T1 of the first amplitude A1 and the first period T1 in the first conductive wire 10 is equal to the second ratio A2 / T2 of the second amplitude A2 and the second period T2 in the second conductive wire 20. The second ratio A2 / T2 of the second amplitude A2 and the second period T2 in the second conductive wire 20 is equal to the first ratio A1 / T1 of the first amplitude A1 and the first period T1 in the first conductive wire 10.

[0043] As an example, let the first amplitude A1 = a, the first period T1 = b, the second amplitude A2 = 2a, and the second period T2 = 2b. At this time, the first ratio A1 / T1 = the second ratio A2 / T2 = a / b.

[0044] Here, displacements x in the front-back direction X and y in the left-right direction Y are given. If the first shape C1 of the first conductive wire 10 is <y = Sin(x)>, then the second shape C2 of the second conductive wire 20 is <y = 2×Sin(x / 2)>. In the range of 0 ≦ x ≦ 2π, the first length L1 of the first conductive wire 10 is given by Equation [Equation 1], and the second length L2 of the second conductive wire 20 is given by Equation [Equation 2]. In the following equations, π is the ratio of the circumference of a circle to its diameter. E is given by Equation [Equation 3].

[0045]

[0046]

[0047]

[0048] Thus, the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 are equal to each other.

[0049] Although detailed description is omitted, the same can be said for the third conductive wire 30 and the fourth conductive wire 40. The third conductive wire 30 extends in the left-right direction Y while vibrating in the front-back direction X. The third conductive wire 30 is a periodic structure having a third amplitude and a third period. The fourth conductive wire 40 extends in the left-right direction Y while vibrating in the front-back direction X. The fourth conductive wire 40 is a periodic structure having a fourth amplitude and a fourth period.

[0050] The third conductive wire 30 has a third length L3. The third length L3 is the total length of the third conductive wire 30, including the detour. The fourth conductive wire 40 has a fourth length L4. The fourth length L4 is the total length of the fourth conductive wire 40, including the detour. The third length L3 of the third conductive wire 30 is equal to the fourth length L4 of the fourth conductive wire 40. Here, "equal" means that an error of about 3% is acceptable.

[0051] The third shape C3 of the third conductive wire 30 is a sine wave. The fourth shape C4 of the fourth conductive wire 40 is a sine wave. The third amplitude of the third conductive wire 30 is different from the fourth amplitude of the fourth conductive wire 40. The third period of the third conductive wire 30 is different from the fourth period of the fourth conductive wire 40. The third shape C3 consists of the third amplitude and the third period. The fourth shape C4 consists of the fourth amplitude and the fourth period. The third shape C3 of the third conductive wire 30 is different from the fourth shape of the fourth conductive wire 40.

[0052] The third ratio of the third amplitude to the third period in the third conductive wire 30 is equal to the fourth ratio of the fourth amplitude to the fourth period in the fourth conductive wire 40.

[0053] (Width and Sides of Conductive Wires) The widths and sides of the first conductive wire 10 and the second conductive wire 20 will be described below. The first conductive wire 10 has a first portion 11 and a second portion 12. The first portion 11 and the second portion 12 are connected in the longitudinal direction of the first conductive wire 10. The first portion 11 has a narrower width H than the second portion 12. The second portion 12 has a wider width H than the first portion 11. The first width H1 of the first portion 11 is narrower than the second width H2 of the second portion 12. The second width H2 of the second portion 12 is wider than the first width H1 of the first portion 11.

[0054] The first conductive wire 10 is bordered by a first side 10a and a second side 10b. The first side 10a and the second side 10b are not parallel to each other. The extension of the first side 10a and the extension of the second side 10b intersect each other. The first side 10a is not parallel to the second side 10b. The second side 10b is not parallel to the first side 10a.

[0055] The second conductive wire 20 has a third portion 23 and a fourth portion 24. The third portion 23 and the fourth portion 24 are connected in the longitudinal direction of the second conductive wire 20. The third portion 23 has a narrower line width H than the fourth portion 24. The fourth portion 24 has a wider line width H than the third portion 23. The third line width H3 of the third portion 23 is narrower than the fourth line width H4 of the fourth portion 24. The fourth line width H4 of the fourth portion 24 is wider than the third line width H3 of the third portion 23.

[0056] The second conductive wire 20 is bordered by a third side 20c and a fourth side 20d. The third side 20c and the fourth side 20d are not parallel to each other. The extension of the third side 20c and the extension of the fourth side 20d intersect each other. The third side 20c is not parallel to the fourth side 20d. The fourth side 20d is not parallel to the third side 20c.

[0057] In Figure 3, the line width H of the first conductive wire 10 and the line width H of the second conductive wire 20 alternate between increasing and decreasing, but this is not limited to this. That is, the line width H of the first conductive wire 10 and the line width H of the second conductive wire 20 may increase continuously in a portion of the figure. Also, the line width H of the first conductive wire 10 and the line width H of the second conductive wire 20 may decrease continuously in a portion of the figure.

[0058] Although a detailed explanation will be omitted, the same can be said for the third conductive wire 30 and the fourth conductive wire 40.

[0059] (Balancing the suppression of light rays and the reduction of thermal unevenness) If the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 were equal, the regularly arranged first conductive wire 10 and second conductive wire 20 would function like slits in a diffraction grating, causing light rays (streaks of light) and causing discomfort to the user.

[0060] Therefore, by making the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 different from each other, light rays are suppressed.

[0061] If the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 are different, uneven heating will occur, impairing the function of the heater 1.

[0062] Therefore, by making the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 equal to each other, thermal unevenness is reduced.

[0063] In summary, we can provide a heater 1 that achieves both the suppression of light rays and the reduction of heat unevenness.

[0064] The first conductive wire 10 has a periodic structure having a first amplitude A1 and a first period T1. The second conductive wire 20 has a periodic structure having a second amplitude A2 and a second period T2. The first amplitude A1 of the first conductive wire 10 and the second amplitude A2 of the second conductive wire 20 are different from each other. The first period T1 of the first conductive wire 10 and the second period T2 of the second conductive wire 20 are different from each other. The first ratio A1 / T1 between the first amplitude A1 and the first period T1 in the first conductive wire 10 and the second ratio A2 / T2 between the second amplitude A2 and the second period T2 in the second conductive wire 20 are equal to each other.

[0065] It becomes easier to make the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 different from each other, and to make the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 equal to each other.

[0066] By making the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 sinusoidal, it becomes easy to make the first ratio A1 / T1 and the second ratio A2 / T2 equal.

[0067] The first conductive wire 10 has a first portion 11 and a second portion 12 which has a wider line width H than the first portion 11. Compared to the case where the first conductive wire 10 extends with the same line width H, it is possible to suppress the light rays generated from the first conductive wire 10 alone.

[0068] The second conductive wire 20 has a third portion 23 and a fourth portion 24 with a wider line width H than the third portion 23. Compared to the case where the second conductive wire 20 extends with the same line width H, the light rays generated from the second conductive wire 20 alone can be suppressed.

[0069] The first conductive wire 10 is bordered by a first side 10a and a second side 10b that are not parallel to each other. Compared to the case where the first side 10a and the second side 10b of the first conductive wire 10 are parallel to each other, the light rays generated from the first conductive wire 10 alone can be suppressed.

[0070] The second conductive wire 20 is bordered by a third side 20c and a fourth side 20d that are not parallel to each other. Compared to the case where the third side 20c and the fourth side 20d of the second conductive wire 20 are parallel to each other, the light rays generated from the second conductive wire 20 alone can be suppressed.

[0071] The heater 1 comprises a transparent substrate 2 and a transparent adhesive layer 3. The first conductive wire 10 and the second conductive wire 20 are arranged between the substrate 2 and the adhesive layer 3. The visibility of the heater 1 can be improved by making both the substrate 2 and the adhesive layer 3 transparent, and by taking measures to prevent light glare on the first conductive wire 10 and the second conductive wire 20.

[0072] The third shape C3 of the third conductive wire 30 and the fourth shape C4 of the fourth conductive wire 40 are different from each other. The third length L3 of the third conductive wire 30 and the fourth length L4 of the fourth conductive wire 40 are equal to each other. It is possible to achieve both the suppression of light rays and the reduction of thermal unevenness not only in the first conductive wire 10 and the second conductive wire 20, but also in the third conductive wire 30 and the fourth conductive wire 40.

[0073] <Second Embodiment> A second embodiment will now be described. In the following description, components similar to those in the above embodiment will be denoted by the same reference numerals, and detailed descriptions will be omitted. Figure 4 shows goggles 100 to which the heater 1 is applied.

[0074] The heater 1 is applied to the goggles 100. In this example, the third conductive wire 30 and the fourth conductive wire 40 are not provided. The first busbar 50 and the second busbar 60 are located on both sides of the goggles 100. The first conductive wire 10 and the second conductive wire 20 are located on the glass portion of the goggles 100. The other configurations are the same as in the first embodiment.

[0075] <Other Embodiments> Although this disclosure has been described above with reference to preferred embodiments, this description is not limiting, and of course, various modifications, substitutions, or combinations are possible.

[0076] The first busbar 50 and the second busbar 60 may be constructed by combining the wiring in a ladder-like manner.

[0077] The shape (first shape C1, second shape C2, third shape C3, and fourth shape C4) of each conductive wire (first conductive wire 10, second conductive wire 20, third conductive wire 30, and fourth conductive wire 40) is not limited to a sine wave, but may be a triangular wave, a square wave, a semicircular wave, or any other shape other than a wave.

[0078] The first conductive wire 10 and the second conductive wire 20 do not necessarily have to be adjacent to each other. For example, multiple first conductive wires 10 may be arranged in the order of first conductive wire 10, first conductive wire 10, second conductive wire 20, and second conductive wire 20.

[0079] The third direction may be different from the second direction. The third direction may intersect the first and second directions at an angle. The first and second directions may intersect at an angle rather than orthogonally.

[0080] <Summary> The heater 1 according to the present disclosure comprises a first bus bar 50, a second bus bar 60 spaced apart from the first bus bar 50 in a first direction (front-rear direction X), a first conductive wire 10 connecting the first bus bar 50 and the second bus bar 60 and extending in the first direction (front-rear direction X), and a second conductive wire 20 connecting the first bus bar 50 and the second bus bar 60 and extending in the first direction (front-rear direction X). The first conductive wire 10 and the second conductive wire 20 are aligned in a second direction (left-right direction Y) intersecting the first direction (front-rear direction X), the first length L1 of the first conductive wire 10 is equal to the second length L2 of the second conductive wire 20, and the first shape C1 of the first conductive wire 10 is different from the second shape C2 of the second conductive wire 20.

[0081] If the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 were identical, the regularly arranged first conductive wire 10 and second conductive wire 20 would function like slits in a diffraction grating, creating light rays (streaks of light) that would be unpleasant for the user.

[0082] Therefore, by making the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 different from each other, light rays are suppressed.

[0083] If the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 are different from each other, uneven heating will occur, impairing the function of the heater 1.

[0084] Therefore, by making the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 equal to each other, thermal unevenness is reduced.

[0085] In summary, we can provide a heater 1 that achieves both the suppression of light rays and the reduction of heat unevenness.

[0086] In one embodiment, the first conductive wire 10 has a periodic structure having a first amplitude A1 and a first period T1, and the second conductive wire 20 has a periodic structure having a second amplitude A2 and a second period T2. The first amplitude A1 of the first conductive wire 10 is different from the second amplitude A2 of the second conductive wire 20, the first period T1 of the first conductive wire 10 is different from the second period T2 of the second conductive wire 20, and the first ratio A1 / T1 of the first amplitude A1 to the first period T1 is equal to the second ratio A2 / T2 of the second amplitude A2 to the second period T2.

[0087] It becomes easier to make the first shape C1 of the first conductive wire 10 and the second shape C2 of the second conductive wire 20 different from each other, and to make the first length L1 of the first conductive wire 10 and the second length L2 of the second conductive wire 20 equal to each other.

[0088] In one embodiment, the first shape C1 of the first conductive wire 10 is a sine wave, and the second shape C2 of the second conductive wire 20 is a sine wave.

[0089] It becomes easier to make the first ratio A1 / T1 and the second ratio A2 / T2 equal.

[0090] In one embodiment, the first conductive wire 10 has a first portion 11 and a second portion 12 having a wider wire width H than the first portion 11.

[0091] Compared to the case where the first conductive wire 10 extends with the same wire width H, the light rays generated from the first conductive wire 10 alone can be suppressed.

[0092] In one embodiment, the second conductive wire 20 has a third portion 23 and a fourth portion 24 with a wider wire width H than the third portion 23.

[0093] Compared to the case where the second conductive wire 20 extends with the same wire width H, the light rays generated from the second conductive wire 20 alone can be suppressed.

[0094] In one embodiment, the first conductive wire 10 is bordered by a first side 10a and a second side 10b, and the first side 10a is not parallel to the second side 10b.

[0095] Compared to the case where the first side 10a and the second side 10b of the first conductive wire 10 are parallel to each other, the light rays generated from the first conductive wire 10 alone can be suppressed.

[0096] In one embodiment, the second conductive wire 20 is bordered by a third side 20c and a fourth side 20d, and the third side 20c is not parallel to the fourth side 20d.

[0097] Compared to the case where the third side 20c and the fourth side 20d of the second conductive wire 20 are parallel to each other, the light rays generated from the second conductive wire 20 alone can be suppressed.

[0098] In one embodiment, the heater 1 comprises a transparent substrate 2 and a transparent adhesive layer 3, and the first conductive wire 10 and the second conductive wire 20 are arranged between the substrate 2 and the adhesive layer 3.

[0099] The visibility of the heater 1 can be improved by making both the base material 2 and the adhesive layer 3 transparent, as well as by taking measures to prevent light streaks in the first conductive wire 10 and the second conductive wire 20.

[0100] In one embodiment, the heater 1 includes a third conductive wire 30 that connects the first conductive wire 10 and the second conductive wire 20 and extends in a third direction (left-right direction Y) intersecting the first direction (front-back direction X), and a fourth conductive wire 40 that connects the first conductive wire 10 and the second conductive wire 20 and extends in the third direction (left-right direction Y), and is spaced apart from the third conductive wire 30 in the first direction (front-back direction X), wherein the third length L3 of the third conductive wire 30 is equal to the fourth length L4 of the fourth conductive wire 40, and the third shape C3 of the third conductive wire 30 is different from the fourth shape C4 of the fourth conductive wire 40.

[0101] It is possible to achieve both the suppression of light rays and the reduction of thermal unevenness not only in the first conductive wire 10 and the second conductive wire 20, but also in the third conductive wire 30 and the fourth conductive wire 40.

[0102] This disclosure is extremely useful and has high industrial applicability because it can be applied to heaters.

[0103] 1 Heater 2 Substrate 2a Top surface 3 Adhesive layer 4 Wiring 5 Redundant wiring 10 First conductive wire 10a First side 10b Second side 10c Center line 11 First section 12 Second section 20 Second conductive wire 20c Third side 20d Fourth side 20e Center line 23 Third section 24 Fourth section 30 Third conductive wire 40 Fourth conductive wire 50 First busbar 60 Second busbar 100 Goggles X Front-back direction (first direction) Xa Front Xb Rear Y Left-right direction (second and third directions) Z Up-down direction Zaa Up Zb Down P Power supply L1 First length L2 Second length L3 Third length L4 Fourth length C1 First shape C2 Second shape C3 Third shape C4 Fourth shape A1 First Amplitude A2 Second Amplitude T1 First Period T2 Second Period A1 / T1 First Ratio A2 / T2 Second Ratio H Linewidth H1 First Linewidth H2 Second Linewidth H3 Third Linewidth H4 Fourth Linewidth I1 Point I2 Point J1 Point J2 Point K1 Midpoint K2 Midpoint

Claims

1. A heater comprising: a first busbar; a second busbar spaced apart from the first busbar in a first direction; a first conductive wire connecting the first busbar and the second busbar and extending in the first direction; and a second conductive wire connecting the first busbar and the second busbar and extending in the first direction, wherein the first conductive wire and the second conductive wire are aligned in a second direction intersecting the first direction; the first length of the first conductive wire is equal to the second length of the second conductive wire; and the first shape of the first conductive wire is different from the second shape of the second conductive wire.

2. The heater according to claim 1, wherein the first conductive wire has a periodic structure having a first amplitude and a first period, the second conductive wire has a periodic structure having a second amplitude and a second period, the first amplitude of the first conductive wire is different from the second amplitude of the second conductive wire, the first period of the first conductive wire is different from the second period of the second conductive wire, and the first ratio of the first amplitude to the first period is equal to the second ratio of the second amplitude to the second period.

3. The heater according to claim 2, wherein the first shape of the first conductive wire is a sine wave, and the second shape of the second conductive wire is a sine wave.

4. The heater according to any one of claims 1 to 3, wherein the first conductive wire has a first portion and a second portion having a wider wire width than the first portion.

5. The heater according to claim 4, wherein the second conductive wire has a third portion and a fourth portion having a wider wire width than the third portion.

6. The heater according to any one of claims 1 to 3, wherein the first conductive wire is bordered by a first side and a second side, and the first side is not parallel to the second side.

7. The heater according to claim 6, wherein the second conductive wire is bordered by a third side and a fourth side, and the third side is not parallel to the fourth side.

8. A heater according to any one of claims 1 to 3, comprising a transparent substrate and a transparent adhesive layer, wherein the first conductive wire and the second conductive wire are disposed between the substrate and the adhesive layer.

9. A heater according to any one of claims 1 to 3, comprising: a third conductive wire connecting the first conductive wire and the second conductive wire and extending in a third direction intersecting the first direction; and a fourth conductive wire connecting the first conductive wire and the second conductive wire and extending in the third direction, and spaced apart from the third conductive wire in the first direction, wherein the third length of the third conductive wire is equal to the fourth length of the fourth conductive wire, and the third shape of the third conductive wire is different from the fourth shape of the fourth conductive wire.

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